Marcum Technologies LX7 User manual

LX7
Digital Sonar Unit
User Manual
www.marcumtech.com

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Table of ConTenTs
Introduction ...................................................3
Features......................................................3
Getting Started ................................................3
Ice System Set-Up ...........................................3
Operation.....................................................4
Control Panel ...............................................4
Zoom .......................................................10
Cone Angle Info...............................................11
Interpreting Signals ............................................11
How To Decide Which Configuration To Use ......................13
Tips For Using Your Lx-7........................................14
Charging The Battery ..........................................15
Some Common Sense Safety Tips: .............................15
To Charge Your Battery: ......................................15
Open Water Application ........................................16
Two-Year Warranty ............................................16
How To Obtain Service .........................................17

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InTroduCTIon
Congratulations on purchasing the Marcum LX-7 Digital Sonar—the most
advanced ice sonar system available. When Marcum was founded over a
decade ago, we all knew that our original flashers were just the beginning.
Every step of the way, we have been designing, improving, building momen-
tum. This momentum keeps us in nearly perpetual motion, on the Vanguard
of innovation, with our competition forever in our rear-view mirror. We’re glad
you’ve joined us in the front seat. While our existing product lines have always
beat the competition in every category, up until now there has always been
room for lively discussion as to the merits of various systems. These discus-
sions will now come to a stop as we usher in a new era in ice fishing
electronics: The LX-7. The LX-7 is the most advanced ice fishing sonar
ever designed, now that you own one you’re about to see why.
What makes the LX-7 tick? The LX-7 Digital Sonar takes DNA from other fine
Marcum sonars –you might say it was “bred” for excellence. Because the
LX-7 is digital, we can pack it full of more features than have ever been found
in an ice sonar before. With an 8" customizable dashboard display, superior
target separation, 12-level interference rejection, dual-beam transducer,
expandable zoom, and much, much more, the LX7 is the perfect combination
of macro features and micro precision.
feaTures
•8”LCDMonitor—NoFishnderiseasiertosee
•DualBeamTransducer—Quicklyswitchbetween20degreeand8degree
•Ruggedtransportshuttlewithextendabletransducerarm
•Paddednylonsoftpackofferstheultimateinprotection
•Protectiveclearshield
•12volt9ampbatterywithautomatic3-stagecharger
•2yearwarranty
•User-friendlyfullyadjustablezoom
•DashboardDisplaykeepstheanglerupdatedwithcriticalinformation
•Fivedifferentsonarwindowstochoosefrom,displayuptothreeatonce
•Silentoperation
GeTTInG sTarTed
Ice System Set-Up
YourLX-7comesvirtuallyreadytosh.RemovetheLX-7fromthepackag-
ing and place on a level surface with the MarCum Technologies logo facing
towards you and right side up. Open the top cover of the soft pack by lifting
up on the Velcro closures on each side and front of the soft pack. Once

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opened, loosen the knobs on the either side of the gimbal bracket (at the base
of the monitor) by turning each one counter-clockwise. Make sure to loosen
the knobs a considerable distance. The monitor can now be positioned how
you want it. Once the monitor is positioned how you want it, tighten the knobs
again to hold the monitor in place. The front panel of the soft pack can be
folded up and secured behind the monitor with the hook and loop fasteners.
Hook up the LX-7 power cord to the battery by plugging the pigtail lead into the
receptacle on the wiring harness coming off the battery. Your LX-7 is delivered
witha9ampbatterythatischarged,soyoucantakeitshingrightaway.Even
though the battery comes charged, if you are not going fishing immediately, you
should hook up the charger anyway to make sure the battery has a full charge.
To charge the battery, see below. The LX-7 will operate for 10 hours or more on
a fully charged battery. If you are going to be in situation where you will want to
use your system for more than one day without recharging, having a second,
fully charged battery with you is cheap insurance that will ensure you will be
able to get full use out of your system for the duration of your trip.
Inside the LX-7 deluxe softcase is an electronics shuttle that has compartments
for the battery and the dual beam transducer, as well as the transducer arm.
The adjustable transducer arm allows for maximum flexibility in positioning the
LX-7 around the ice hole, and can even be moved to the other side of the shuttle.
Using the LX-7 can be as simple as turning it on—the factory settings will come
on automatically and allow you to use the LX-7 in the most popular configuration.
Be sure to explore all of the options available to customize your Dashboard
Display. With five different sonar portals, four color palettes, 2 cones angles,
and a myriad of other settings, there are many possibilities. It is easy to explore
these options, and you can set the LX-7 so that it defaults to your preferred
arrangement. Changing your settings is easily done on the fly, but experiment-
ing while using the simulator at home will help you learn the “flow” of the menu
and settings.
oPeraTIon
The LX-7 has many functions and settings that are selected or changed by
buttonsontheControlPanel.Learningwhateachofthebuttons(POWER,
SENS,RANGE,ZOOM,IR,CONEANGLE,TARGETADJUST,MENU/ENTER,
UP, DOWN) does will enable you to get the most out of your LX-7. Note that
you can experiment with different settings and dashboard arrangements in
SIMULATORmode.Manyoftheselectionswillactivatejustbyhighlighting
your desired setting.
Control Panel
The following is an explanation of each button on the control panel and what
it does. Some of the button functions can also be accessed in the main
menu. Pressing any of the Control Panel buttons will cause a window to open,
enabling the user to make the desired adjustments. All button function windows
will time out after about 10 seconds. Any changes made to the settings will acti-
vate when the MENU button is pressed, or after a few seconds without activity.

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POWER - Press and hold this button for 2 seconds to turn your unit on or off.
SENS - The SENS (sensitivity) button controls the amount of sensitivity required
by the unit to pick up objects like bottom, weeds, fish, smaller bait-fish, or small
lures and jigs. The lower the number, the less sensitivity, conversely higher
numbers mean more sensitivity. To adjust your sensitivity, first press the SENS
buttonandabarwillappearatthebottomofyourdisplay.PressingtheUP/
DOWN will adjust your sensitivity, and the sensitivity setting will now be digitally
displayed on the SENS gauge. The best SENS setting is achieved by turning
up your sensitivity from 0 until you receive a clear and steady bottom reading.
To see your lure or bait, turn up the SENS some more until you just begin to
display your bait without it fading or flickering on the screen. The sensitivity will
go up to 25, but a setting between 5 and 10 is likely to be where you want it
set in most instances. Too much sensitivity will only display with unnecessary
information, showing clutter and making it more difficult to interpret the return
signals. Clutter can be caused by any number of suspended items, including
algae, zooplankton, tiny bubbles, and other particles.
RANGE—TheLX-7isequippedwith“AutoRange”and“DynamicDepth”.
The LX-7 will automatically lock onto the proper range with either of these
settings.Therearealso9manuallyadjustabledepthranges—10,20,40,60,
80, 120, 180, 240 and 300-feet. If you manually select a range, select a range
that is deeper than the actual depth and when in doubt, error on the “deep”
side.Regardlessofthedepthrangesetting,yourLX-7willalwaysdisplay
digitaldepth,evenifthebottomisdeeperthanthebottomlimitoftheRANGE
setting(downto300’).Tochangeyourrangesetting,pressRANGEand
scrollupordownusingtheUP/DOWNButtons.Whenthedesiredrangeis
highlighted, press MENU to instantly change, or just wait for a moment and the
LX-7 will lock into the selected range automatically.
AUTO RANGE—TheLX-7hasanAutoRangefeaturethatallowsyoutosimply
turnontheunitandbeginshing.ToenterAutoRange,pressRANGE.This
will open a window with 11 range options. Now use the UP button to highlight
“Auto”. Now press MENU, and the LX-7 will automatically lock into the appro-
priate depth range. For instance, in 32 feet of water, the LX-7 will lock into the
40 foot range. In 45 feet of water the LX-7 will automatically lock into the 60
footrange.YourRangegaugewillshowan“A”,andtheneedlewillbeallthe
way to the left.
DYNAMIC DEPTH – This Marcum exclusive feature functions similarly to the
“AutoRange”,butnetunesyourrangeevenfarther.TheDynamicDepthwill
maximize the space on your display by utilizing a constantly variable range that
will always be just slightly deeper than the actual depth. For example, if you
were fishing in 23 feet of water, the Dynamic Depth range will be 25 feet, if you
werein29feetofwater,theDynamicDepthrangewillbe32feet.TheDynamic
Depth range will not go shallower than 10 feet.
MANUAL RANGE— TomanuallyadjusttheLX-7’sdepthrange,pressRANGE.
Thiswillopenawindowwith9rangeoptions.NowusetheUPorDOWNbutton
to highlight whichever range you would like to be in. The LX-7 will lock in your
selected range as soon as the selected range has been highlighted.

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ZOOM—The ZOOM button allows you to select the upper range of the portion
of the water column you would like to zoom in on. The actual size of the Zoom
window can be adjusted in the Main Menu.
The Zoom feature allows you to focus the display on a specific depth within
the water column, and can be a great benefit in a variety of fishing situations.
See the separate ZOOM section below for more info on the ZOOM. Whenever
you are utilizing the zoom menu, keep in mind that the menu will “time-out”
after 10 seconds.
IR (INTERFERENCE REJECTION)—TheInterferenceRejectionsystemis
designed to suppress competing return signals from other sonar units being
used within close proximity. When other sonar units are causing interference
tothedisplayoftheLX-7,activatetheIRfeaturebydepressingtheIRbutton
located on the control panel of the LX-7. Interference is indicated by unusual
signals flashing or scrolling across your display.
Thereare12levels,orchannels,ofinterferencerejection.PresstheIRbutton
oncetoopentheIRwindow,nowusetheUP/DOWNbuttonstoselectthe
desiredlevelofIR.ThecorrectlevelofIRwillbeachievedwhenthedisplayis
clear of display clutter. In some extreme cases, clutter will be greatly reduced
but not totally eliminated.
Anytime two or more sonars are being operated in proximity to each other, there
is the potential for interference. Deep water and hard bottom will increase the
likelihood that one or more of the competing sonars will experience interfer-
ence.BesidesexperimentingwithdifferentlevelsofIR,theanglersexperiencing
interference can also try having their transducers set at different levels, going to
narrow cone angles, and reducing gain or sensitivity settings.
CONE ANGLE—All transducers send down a signal that is shaped somewhat
like a cone. Your LX-7 easily switches from a 20 degree cone angle (good
for general use) to a narrow 8 degree cone angle (good for water over 40', or
any time you need a more precise view of what is below you). See the special
section on Cone Angles below for more info. A feature unique to the LX-7 is
the “Sonar Footprint” that displays the actual extent of coverage by your trans-
ducer while you are fishing. This data is displayed below the cone angle icon,
and represents the diameter of the base of the transducer cone. This will keep
you constantly updated how much area is being covered by your LX-7, and will
help you decide which transducer angle best suits the conditions. When the
LX-7 is first turned on, it will be transmitting utilizing the 20-degree setting.
To switch from 20 degree to 8 degree, simply press the CONE ANGLE button
onceandusetheUP/DOWNbuttonstohighlightthedesiredselection.
The cone angle changes as soon as you highlight a selection and the Sonar
Footprint will change with it.
TARGET ADJUST—This feature allows the angler to change the size of the
signals being displayed without increasing the sensitivity. Depending on the
angler’s preference, the signal size can be easily changed from a razor thin
linetoathickerband.TheTARGETADJUSTfeaturewillgiveyouthethinnest,
smallest, signal size at “0”, and the signals displayed will get thicker as you

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increasetheTARGETADJUST.Thisfeatureshouldbeusedinconjunction
with the SENS to fine-tune your display. Anglers who have a hard time seeing,
as well as those who fish from a standing position will really appreciate the
“TARGETADJUST”feature.
BATTERY METER—This gauge indicates the voltage currently being
produced by your battery. The LX-7 needs between 11 and 13 volts to prop-
erly operate. If the voltage drops below 11 volts, you may see a decrease in
performance.Rechargingyourbatteryaftereachusewillmaximizethelifeof
your battery, and will ensure that your LX-7 will run strong all day.
MENU/ENTER—This button enables you to access other functions of the
LX-7. Some of these functions are also accessible through the use of the
other buttons on the Control Panel. When you press the MENU button, three
sub-menuswillberevealed—SONARSETTINGS,DISPLAYOPTIONS,and
SYSTEM SETTINGS.
Use the arrow buttons to highlight the desired sub-menu, and press MENU
again to access to the sub-menu.
SONAR SETTINGS is the first sub-menu, and it has the following features
that may be adjusted:
SENSITIVITY This adjusts the sensitivity. This is described in the Control
Panel section above
RANGE Select range in the same manner as described above
ZOOM DEPTH Here is where you set the upper range of the zoom window.
This can also be done by using the ZOOM button as
described above. The actual size of the zoom window is
adjusted in the “Zoom Window” field.
ZOOM WINDOW Here is where you determine the size of the Zoom Window.
Go to the “Zoom” section of the manual for more specific
information.
IR InterferenceRejectioncanbeadjustedhere,aswellasby
using the Control Panel button. See above for more info.
TARGET
ADJUST
Target Adjust can be adjusted here, as well as by using the
Control Panel button. See above for more info.
CONE ANGLE Cone Angle [and Sonar Footprint] can be adjusted here, as
well as by using the Control Panel button. See above for
more info.
SONARMODE Choose between “ice fishing” and “open water” mode here
MAXPINGRATE Adjusting this setting will increase the response time of
signals from your transducer to the screen. If fishing shallow
water (less than 20 feet) use the lower settings. Likewise,
you will see better performance with the higher settings in
deeper water.

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DISPLAY OPTIONS is the second sub-menu, and it has the following
features that may be adjusted
FLASHERDISPLAY The Flasher Display can be turned on or off here
VERTICALDISPLAY The Vertical Display can be turned on or off here
VERTICALZOOM
DISPLAY
The Vertical Zoom Display can be turned on or off here
CHARTDISPLAY The Chart, or Scrolling graph, can be turned on or off
here
CHARTZOOM This enables you to use the scrolling graph in zoom
mode
GAUGE DISPLAY Your 5 gauges, as well as your Sonar footprint may be
turned on or off here
TEMPERATURE Your water temperature display may be turned on or
off here. You may also select between Fahrenheit and
Celsius here. This feature will only work if you are using
your unit with the optional “Universal Sonar”, designed
for open water use.
BACKLIGHT You can adjust the overall brightness level of the display
here. When using outside during bright conditions, you
will want to have it set fairly high, at 50 or more. In low
light or when using inside an ice shack, a setting of 50
or less is desirable.
COLORPALETTE There are four different color palettes; you choose
which one you prefer here. See the section below on
Color Palettes below for more info.
BACKGROUND There are three different backgrounds; you choose
which one you prefer here. The “Night” option is great
for low light periods or when in a darkened shack.
SYSTEMS SETTINGS is the third sub-menu, and it has the following
features that may be adjusted
LANGUAGE Choose between English and French
UNITS Depth can be displayed in feet or meters
SIMULATOR The LX-7 has a simulator mode that will portray a variety of
different depths and signal returns. Activating this feature
enables the user to experiment with the various settings
without actually being on the water. This simulator repre-
sents an open water experience, so the depths and signals
will change as it goes through the simulation.

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RESTORE
FACTORY
This is where you can restore factory settings. The factory
settings are the most popular configuration, and if at any
time of changing your selections you want to revert back to
this screen, you may easily do so here.
RESTORESAVED If you find a screen configuration that you like, you can
easily return to that saved screen by highlighting this selec-
tion
SAVE This is where you can save your favorite screen
configuration.
When you turn the LX-7 on, it will power up to your last
screen displayed. You can now change it to the original
factorysettingsbyhighlighting“RestoreFactory”.While
out fishing, you may find a particular screen configuration
that you like. Access “System Settings”, highlight “Save”,
and press MENU. You may now move through other screen
congurations,butcomebacklaterbypressing“Restore
Saved”. Turning the LX-7 off will set that screen configura-
tion as “Saved”.
COLOR
PALETTES
Use this feature to choose which of the 4 color palettes you
prefer. Option 1, Option 2, Option 3, Option 4
ThedefaultsettinghasREDasrepresentingthestron-
gest signal, often signifying a hard bottom or a larger fish
thatisinthecenterofthetransmitsignal(cone).GREEN
represents a softer bottom or smaller fish in the middle
of the transmit signal or a larger fish on the outside of the
transmit signal. YELLOW represents weaker signals and
often signifies weeds, small bait-fish, medium-sized fish on
the outside of the transmit signal. When using the other
color palettes, the colors displayed and the signal strengths
represented will change accordingly.
SIMULATOR— The LX-7 has a simulator mode that will portray a variety of
different depths and signal returns. Activating this feature enables the user to
experiment with the various settings without actually being on the water. This
simulator represents an open water experience, so the depths and signals will
change as it goes through the simulation.
GAUGES— A feature unique to the LX-7 is the ability to be able to constantly
see where your most critical settings are at. At a glance, you will be able
totellwhatyourSensitivityisat,whatlevelofIRyouareoperatingat,how
high your Target Adjust is, your range, and battery status displayed in volts.
The gauges can be turned on or off by pressing MENU, highlighting “Gauge
Display”, and making your selection. Where the gauges display will depend on
which screen configuration you have selected.

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ZooM
One of the best features to have in an ice fishing Sonar is a “Zoom”, and there is
none better than that of the LX-7. A Zoom feature enables you to have a magni-
fied view of a selected portion of the water column. Note that when the ZOOM
window is open, you can still view the entire water column on one of the other
windows. Imagine that you are fishing for walleyes in 30 feet of water, and you
are zoomed in on the bottom 5 feet. If a school of crappies comes through at 20
feet, you will be able to easily see them on one of the other windows, and quickly
raise your bait to their level. The position of the ZOOM window is adjustable in
one-foot increments. The ZOOM can focus on bottom (for detecting bottom-
hugging fish), or at any level above bottom.
The LX-7 also offers Auto Bottom Track Zoom that automatically zooms and
locks onto the bottom, even when you change locations. This is especially useful
for if you are hole-hopping for bottom hugging fish like walleyes and perch. To
access the Auto Zoom, press ZOOM, and then press the UP button until “A”
(Auto) appears. It will appear after you pass “0” on the Zoom Window.
The ZOOM feature on the LX-7 can be accessed in several ways depending on
which sonar windows you have displayed on your dashboard. Having your LX-7
set at the factory default setting for a screen configuration will make it easiest
to learn how to use the Zoom. It is highly recommended that you learn how the
Zoom works while in simulator mode. Operating the Zoom is quite simple, and
only requires the pressing of a few buttons to select the size and position of your
Zoom Window.
So, start by having the factory default screen (Flasher in center, Vertical Display
on left, Vertical Zoom on right) open. The area that is featured on the Zoom
Display is indicated by the “Zoom Indicator Bar”, a light blue bar on the right
side of the Vertical Display. When you press the ZOOM button, a “Zoom Depth”
window will appear at the bottom of the screen. This is where you set the
uppermostlimitoftheZoomDisplaybypressingtheUP/DOWNbuttons.When
you have the desired depth highlighted, pressing ZOOM again will establish that
depth as the top of your Zoom display. You will notice that the Zoom Indicator
Bar will move up or down as you make these adjustments. To set the size of what
is shown in the Zoom Display, press MENU, and then highlight “Zoom Window”.
You can now select which size zoom window you want.
Going through this process several times before you go fishing is a great idea,
as that will allow you to easily and quickly make adjustments right away once on
the water.
If you have only the Flasher Display, the Vertical Display, or the Scrolling Graph
Display open, and go into zoom mode, pressing the “ZOOM” will cause the
vertical zoom window to appear, and a “Zoom Depth” window will open at the
bottom of the screen. You will still set the uppermost limit of your zoom window
here, but you won’t have the advantage of having the Zoom Indicator Bar to
show you exactly what area is being highlighted. With a little bit of experience,
you’llndthistobequiteeasytodo.Justsetthezoomdepthfor5,10,20,
or 40 feet above the bottom, and then set the Zoom Window to the size that is
appropriate.

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For example, if you were fishing in 30 feet of water, and wanted to zoom in on
the bottom 10 feet, press ZOOM, and then set the zoom depth for 20 feet (10
feet off bottom). Now press MENU, highlight “Zoom Window”, and select 10
feet. The 20 to 30 foot portion of the water column is now displayed on the
Zoom display, and the entire water column is viewable on the flasher window.
The LX-7 also features “Chart Zoom” which enables you to use a scrolling
graph in Zoom mode. Activate the Chart Zoom in the Display Options of the
menu. You set the zoom just as you would when using the other sonar options.
When you press the ZOOM button to make a change, the Vertical Zoom
window will automatically open. After adjustments have been made, you may
turn the Vertical Zoom window off again in the Display Options of the menu.
Cone anGle Info
A feature unique to the LX-7 is the “Sonar Footprint” that displays the actual
area being covered by your transducer while you are fishing. This data is
displayed below the cone angle icon, and represents the diameter of the base
of the transducer cone. This will keep you constantly updated how much area
is being covered by your LX-7, and will help you decide which transducer angle
best suits the conditions. When the LX-7 is first turned on, it will be transmitting
utilizing the 20-degree setting. To switch from 20 degree to 8 degree, simply
press the CONE ANGLE button once, and the CONE ANGLE icon will change
from 20 degree to 8 degree, and the Sonar Footprint will change with it.
Conditions where the narrow beam will benefit you are:
1—Fishing in deep water (over 40’) for walleyes, perch, or lake trout
2—Fishing along very steep drop-offs for bottom-hugging walleyes
3—Fishing in big schools of fish, like suspended crappies or tullibees
4—Fishing in and around heavy weeds for panfish, like bluegills and crappies
5—Fishing in a crowd, the narrow beam will reduce interference from your
neighbor
InTerPreTInG sIGnals
DIGITAL DEPTH— The digital depth display on the LX-7 provides a quick and
easy way to determine depth. Digital Depth is always displayed in the center of
the circular display, and on the bottom of the vertical displays. It will also show
in the upper left corner of the graph in some configurations. This display can
be used as a quick reference when checking depths through the ice.
READING BOTTOM— When interpreting your bottom signal, always read the
leading edge (shallowest side) of the signal return. If you have a strong signal
return (wide band) and it starts at 13 feet and ends at 16 feet, the correct depth
is 13 feet or the shallowest leading edge of the return signal. Anything beyond
the shallowest leading edge indicates the strength of the return signal.
Your LX-7 can also be used to determine bottom composition. The thicker
and bolder your bottom shows, the harder the bottom is. In some cases, hard

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bottom can be indicated by a “double” or second echo that will show on your
display at approximately twice the water depth. Soft bottom (silt, mud, muck)
will only register one bottom reading. Using your Sonar in conjunction with an
underwater viewing system is a great way to learn how to interpret your sonar
signals.
READING FISH— Fish will generally appear as separate targets from the
bottom. Using the factory default color palette, a fish target can be displayed
asRED,GREEN,orYELLOW,dependingonthesizeoftheshandtheloca-
tion within the transmit beam. Larger fish located in the center of the beam
(cone)canappearREDandwillbedisplayedasawiderbandonthedisplay.
Smaller fish or fish on the outside of the cone may appear green or even yellow.
Fish moving through the transmit beam may change color as the return signal
strengthens or weakens reflecting their location.
Some fish, like walleyes, are notorious for cruising right on the bottom. The LX-7
has target separation fine enough that it will generally show bottom hugging
fish as a separate signal. However, fish that are right on the bottom can appear
as part of the bottom. The best indication of a fish sitting right on the bottom is
thattheleadingedgeofthebottomreturnsignaliseitherGREENorpossiblya
ditheringorickeringREDsegment.Itisimportantthatthesensitivitybekept
to a minimum when displaying a strong bottom return. Having your sensitivity
too high will flood out the ability to differentiate targets and clutter the display.
Utilizing the ZOOM feature can give you a magnified look at the bottom when
this is happening, and help you better learn what is going on below you.
Schooling fish, like crappies or white bass, will sometimes group in large
numbers suspended off the bottom. A big school of fish concentrated in one
portion of the water column can show on your sonar as one large “blob”, and it
can be difficult to pick out individual targets. Zooming in on the zone with the
most fish will give you better definition, and switching to the 8 degree cone will
eliminate signals from fish on the periphery of your area, improving your defini-
tion even more.
READING LURES AND JIGS—The LX-7 will pick up and display the smallest
of lures and jigs. When tuning the unit to display your lure, lower the object to
the desired depth and turn up the SENS until you see the lure or bait on the
display. It is important that the SENS be set so it displays the lure or bait as you
raise or lower it. Once you have the SENS set where you want it, you can fine-
tuneyoursignalsbyusingtheTARGETADJUSTbutton.
NOTE: When tuning the unit to display lures or bait, make sure that the objects
are in the center of the hole and therefore in the center of the transmit beam. If
there is current (some lakes and all rivers have underwater current or movement)
and the lure doesn’t weigh much, it may move to the outer edge of the signal or
out of the transmit beam altogether. This will make it difficult or impossible to
pick it up on the display.
The LX-7 has sensitivity that will enable it to display the smallest ice jigs, as well
as sinkers and swivels, at all depths. The target separation of the LX-7 is down
to ½". This means that two objects that more than ½” apart can show as two

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separate signals on your display. If you have a strike and fail to hook the fish,
you can even determine if you still have bait on your jig, or if you have to reel up
and re-bait based upon how the signal appears.
Dead Zone - All sonar units will have a dead zone in certain circumstances.
This occurs on sharp drop-offs where the transmit beam (cone) hits the shal-
lower edge of the drop-off and returns before the deeper edge returns. This in
effect creates an undisplayed area between the shallower and deeper water
within the transmit beam. The 8 degree transmit option on the LX-7 will greatly
reduce this effect.
How To Decide Which Configuration To Use
With 5 different sonar windows, along with a plethora of other settings, it can be
hard to decide on which one to display. If you have used traditional mechani-
cal flashers in the past, you may like the familiarity of the LX-7’s flasher display.
The flasher displayed with one or more of the vertical display is likely to be how
most anglers use the LX-7, at least for starters. We get endless feedback on
how well the scrolling graph display works for ice fishing, so be sure to give it a
try. Be sure to experiment with different color palettes and backgrounds, too.
CIRCULAR [FLASHER] DISPLAY— This Sonar window will read much like a
traditional flasher-style display. You can set the range manually, or allow the
AutoRangeorDynamicDepthInterfacetoautomaticallylockintoaRANGE
that will optimize the use of the circular display. Signals are displayed as various
colored lines on the dial, and the different colors represent different signal
strengths.
VERTICAL DISPLAYS— These Sonar Portals are very easy to interpret—top
is the top, bottom is the bottom. Anything in between the top and bottom is
weeds, fish, or your lure. There are two different Vertical displays—one shows
the entire water column, one shows your ZOOM window. On each one, signals
are displayed as various colored lines on the column, and the different colors
represent different signal strengths.
SCROLLING GRAPH (CHART) DISPLAYS— These displays will show not
only what is happening below you in real time, but will also enable the user to
have a “history” of what has happened. While most commonly used for open
water, many anglers are discovering the benefits of using a graph on the ice.
The LX-7 stands apart from other graphs in that it displays with ultra-fast
“True-Time” sonar response – less than .02 seconds between the echo reaching
the transducer and when signal appears on LCD screen. Other graphs experi-
ence a much longer response time. When used from a boat in open water, the
user will see signals displayed in classic “Graph” fashion; the bottom will be a
solid band, and fish or other objects display as “arches”.
When used from a stationary position, such as ice fishing, the bottom will
display as a solid band, but other signals, like fish or your jig, will display as
lines of varying thickness. Always remember that the thicker the band, the
stronger the signal. A large fish is likely to display as a fairly thick band, while a

Versa Electronics www.marcumtech.com
- 14 -
small ice jig will show as a very fine line. The best way to learn how to interpret
signals on the graph is to have it displayed along with the circular or vertical
display. After using the graph along with one of the more familiar displays, you
may find that you like fishing with the graph best of all. It is fascinating to watch
the “trail” of your jigging motion, and fine tuning your presentation to exactly
what the fish want has never been easier.
The LX-7 has the option of displaying a full water column graph, as well as an
adjustable zoom graph.
The interpretation of these signals improves with experience and use in the field.
TIPs for usInG Your lX-7
Setting up the transducer for ice fishing: When used in conjunction with the
retractable pivoting transducer arm and rubber stopper, the LX7’s transducer
will automatically level itself in your ice hole. To begin operation, take the
transducer out of the recessed holder, and rotate the adjustable ice arm out
from inside the shuttle. Extend transducer arm, (the cable should already be
threaded through it with stopper in place) and deploy the transducer into the
water. We recommend setting your stopper to have the transducer down the
least amount possible. The LX-7 puts out enough power that in most cases it
is not necessary to have your transducer down more than a few inches below
the water line to get a good reading. When the ice thickness is over two feet, it
maybenecessarytohaveyourtransducersetfartherdown.Remember--the
less transducer cable you have out, the easier it is to pull it out of the water
when bringing in a fish, or to move to a new location.
Moving the LX-7 to a new location—Being mobile is one of the keys to being
successful on the ice. Whenever you move from one spot to another, it is
tempting to leave your transducer hanging on the transducer arm. This is likely
to lead to failure of the transducer arm, and can cause damage to the trans-
ducer itself if it is allowed to drag on the ice. Always stow the transducer inside
the pack when you are moving. Keeping the amount of transducer cord you
have out at a minimum will make transporting your LX-7 easier. Similarly, you
may need to quickly remove your transducer from the hole when about to land
a fish. We have actually seen anglers in a panic actually grab the shuttle itself
and toss the entire unit to the side. This is no way to treat any piece of electron-
ics; a much better approach is to simply lift the transducer out of your way by
the cord, and the shuttle itself can be gently pushed aside. When moving from
hole to hole, your LX-7 can be easily carried by the nylon handle. Whenever
you are moving via sled or vehicle, always fold up your transducer arm, stow
the transducer inside, and close the protective soft pack.

Versa Electronics www.marcumtech.com
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CHarGInG THe baTTerY
Your Marcum system comes with a 3-stage battery charger. This style of
charger has proven to be the most effective and easiest to use of all charging
systems available. While the rate of charge is low, a completely discharged
battery can be brought back to a full charge in as little as 12 hours. Because
this is a 3-stage charger, there is no danger of overcharging your battery.
When properly cared for, a sealed lead acid battery will last for at least a
couple of years. Batteries are made to be used, and they need to be used to
make the most of them. The most important thing you can do is to promptly
recharge your battery after each use. Not charging your battery immediately
after use is the number one thing that leads to battery failure. When you get
home from a trip, put your battery on charge right away, and leave it there
overnight, or for around 8-12 hours. We often talk to people who hesitate
to charge their battery after each use for fear that the battery will develop
a “memory” and this will lead to a shortened run time—THIS IS FALSE!!!
ALWAYSCHARGEYOURBATTERYAFTEREVERYUSE!!!Besuretousethe
charger that came with your system, or a similar one that is between .5 amp
and1amp.Usingalargercharger,likeyouwoulduseonacar,truck,RV,or
boat is likely to cause damage to the battery. There is really very little danger
of overcharging your battery with a low amp charger, and most chargers auto-
matically go into “maintenance mode” once a full charge has been achieved.
A 3-Stage charger works like this—
Stage 1 (Bulk Stage): Constant current charging at a high voltage level at
maximum amperage to minimize charge time.
Stage 2 (Absorption Stage): Current tapers off for final 10% of charge.
Stage 3 (Maintenance Stage): Lower voltage mode to prevent electrolyte loss,
keeping your battery at full charge indefinitely.
Some Common Sense Safety Tips:
For safety reasons, it is recommended that you place your system on a flat,
hard surface like cement or tile when charging it, away from any flammable
materials. Be sure to disconnect the charger from the wall when not in use,
and avoid leaving your battery hooked up to the charger for extended periods
of time.
To Charge Your Battery:
Your battery has a wiring harness attached to it that has “piggyback” termi-
nals on it, enabling you to keep the power cord from the unit attached to the
battery at all times, as well as having the wiring harness with receptacle for
your charger attached at all times. To charge, simply couple the end of the
charger with the end of the wiring harness. It is normal for a green light to
appear on the charger at this time. Once connected, plug the transformer
end of the charger into a 110 volt AC wall outlet. You will see a red LED light
appear on the charger at this time. When your battery is fully charged, this

Versa Electronics www.marcumtech.com
- 16 -
red light will change to green. Depending on the condition of your battery, this
process can take up to 20 hours to complete. At this time, you can disconnect
the charger from the battery and wall outlet. However, no harm will come to
your battery if you leave it attached to the charger.
If you need to remove the battery, unplug the two battery terminals from the
battery.RemovetheVelcrostrapthatisholdingthebatteryinplaceandliftthe
battery out. To replace the battery, place a new battery of similar specifica-
tions into the battery compartment and secure it with the hook and loop strap
and re-connect the positive and negative terminals.
oPen WaTer aPPlICaTIon
The LX-7 is just at home on a boat as it is in your ice shack. The Universal
Transducer [sold separately]is designed to be mounted right to your boat’s
transom, or to the lower unit of a bow-mounted trolling motor. This design
makes it easy for you to use your LX-7 for high speed scouting work, or
for breaking down a piece of structure one piece at a time. The Universal
Transducer can transmit an 8 or 20 degree cone, and it also has a temperature
sensor.
From an anchored or otherwise stationary position, you can use your LX-7
from a boat much like you would on the ice—you can see the fish and how
they react to your jig on the screen.
TWo-Year WarranTY
Versa Electronics warrants this product to be free from defects in materials
and workmanship for two years from the date of purchase. This warranty
applies to customers who properly fill out and return the warranty card
included with this manual. Failure to complete and return the warranty card
voids the warranty. Versa Electronics will, at its sole discretion and without
charging the customer, repair or replace any components that fail in normal
use. Failures due to abuse, misuse, or unauthorized alteration, modification
or repair are not covered. The battery is not covered by the warranty. The
warranty is valid only for the original owner who purchases the unit from an
authorized dealer. Products purchased from on-line auction sites are not
considered under warranty.

Versa Electronics www.marcumtech.com
- 17 -
HoW To obTaIn servICe
We want our products to provide you with a pleasant on-the-water experi-
ence. That means maximum customer satisfaction. If you have a problem with
your unit please contact Versa Electronics toll free number at [phone]
foraReturnAuthorizationNumber(RA#)ore-mailusat[email protected].
No service returns will be accepted without this return authorization number,
which must be clearly marked on the outside of the package. Versa Electron-
ics retains the exclusive right to repair or replace the unit at its discretion.
The customer is responsible for shipping costs associated with returning the
unit to Versa Electronics. Versa Electronics will pay for shipping the repaired
unit back to the customer while it is still under warranty. All out of warranty
services will be charged a fee for service and shipping which must be paid in
advance.AfterobtainingaReturnAuthorizationnumber,theunitshouldbe
securely packed and shipped “pre-paid freight” and insured to Versa Electron-
ics. It is the consumers’ full responsibility to track their products sent out in
the mail or other forms of delivery service. Versa Electronics will not be liable
for lost packages sent out in the mail. Unless specified otherwise, do not
include batteries or other accessories when returning the product for repair.
Versa Electronics will not be responsible for lost or damaged accessories.
Please allow a minimum of 10 business days to complete your repair.
aCCessorIes
Soft Pack
Shuttle
Transducer Arm
Ice Transducer
12v9ampBattery
Power Cord
Battery Charger
Snowshield
Open water transducers
Puck
Hi-speed
Replacementsfortheseitemscanbeorderedoffourwebsite,marcumtech.
com or by calling the toll-free number 888-778-1208
Versa Electronics
3943QuebecAvenueN.
Minneapolis, MN 55427
RA#_________________
Note: The RA number must
be clearly marked on the
outside of the package

Versa Electronics www.marcumtech.com
- 18 -
oTHer GreaT ProduCTs froM versa eleCTronICs
Showdown Troller
The new Showdown Troller Digital Fish Finder is a palm-sized sonar device
with full size performance. For use in either ice-fishing or open water situa-
tions…quickly “troll” from hole to hole while ice-fishing or shoot through your
canoe or kayak in order to find fish and the correct depth. As a scouting tool
it has ne equal; the ultimate in portability is matched to ShowDown’s proven
Crystal-Quick®verticaldisplay.Thesonarinstantlylocksontobottom,and
clearly displays the location of fish and your lure, anywhere in the water
column.
VS825SD
The VS825sd offers several technologies that are the first of their kind, making
this system the most technologically advanced underwater viewing system
available.
Using new technology such as an 8” Solar Intelligent- H2D display will deliver
the sharpest, most vivid display, even in direct sunlight; Color Kill technology
allows you to switch between a Color or Black and White image on demand,
while maintaining crisp screen resolution; On-Screen displays of Camera
Direction, Depth, Temp and Battery Voltage take all of the guess work out of
your camera position so your new VS825sd can be used to hunt for underwa-
ter treasures, locate the “spot on the spot”, observe fish in their natural habitat
or learn how fish react to your lure or bait presentation. The applications are
endless, and it’s never been easier or more fun to view.

www.marcumtech.com
MarCum User Manuals are available for download from
www.marcumtech.com.