Lowrance GlobalNav 310 User manual

INSTALLATION AND
OPERATION INSTRUCTIONS
GlobalNav 310
TM

Copyright © 1997 Lowrance Electronics, Inc.
All rights reserved.
GlobalNav 310™is a trademark of Lowrance Electronics, Inc.
Lowrance®is a registered trademark of Lowrance Electronics, Inc.
WARNING!
USE THIS UNIT ONLY AS AN AID TO NAVIGATION. A CAREFUL
NAVIGATOR NEVER RELIES ON ONLY ONE METHOD TO OBTAIN
POSITION INFORMATION.
Never use this product while operating a vehicle.
CAUTION
Whenshowingnavigation data to a position (waypoint), this unit will show
the shortest, most direct path to the waypoint.It provides navigation data
tothewaypointregardlessofobstructions.Therefore, the prudent naviga-
tor will not only take advantage of all available navigation tools when trav-
elling to a waypoint, but will also visually check to make certain a clear,
safe path to the waypoint is always available.
Thestoragetemperaturefor your unit is from -4 degrees to +167 degrees
Fahrenheit (-20 to +75 degrees Celsius).Extendedstorage temperatures
higher or lower than specified will cause the liquid crystal display to fail.
Neither this type of failure nor its consequences are covered by the war-
ranty.For more information, consult the factory customer service depart-
ment.
All features and specifications subject to change without notice.
Lowrance Electronics may find it necessary to change or end our poli-
cies, regulations, and special offers at any time. We reserve the right to
do so without notice.
All screens in this manual are simulated.

INTRODUCTION .......................................................................................................... 1
INSTALLATION.............................................................................................................. 2
BRACKET INSTALLATION ....................................................................................... 2
POWERCABLE....................................................................................................... 4
ANTENNA ................................................................................................................ 5
SURFACEMOUNT ............................................................................................. 5
MAGNETMOUNT .............................................................................................. 6
POLEMOUNT .................................................................................................... 6
KEYBOARD .................................................................................................................. 7
OPERATION ................................................................................................................. 8
TURNING POWER ON............................................................................................ 8
MENUS .................................................................................................................... 8
FINDINGYOUR POSITION ..................................................................................... 8
COLDSTART...................................................................................................... 8
INITIALIZATION .................................................................................................. 9
POSITION/NAVIGATIONDISPLAYS ....................................................................... 11
NAVIGATION SCREENS .................................................................................... 12
PLOTTER SCREENS .............................................................................................. 14
PLOTTER CURSOR ........................................................................................... 15
PLOTTER OPTIONS .......................................................................................... 15
PLOTTRAIL ................................................................................................... 16
PLOTTERORIENTATION .............................................................................. 16
PLOTTERUPDATERATE.............................................................................. 17
GRID LINES ................................................................................................... 18
ICONS ................................................................................................................ 18
PLACE ICON - CURSOR LOCATION ............................................................ 18
ERASE ICONS............................................................................................... 19
WINDOWS ............................................................................................................... 20
SPECIALWINDOWS .......................................................................................... 20
SATELLITE INFORMATIONSCREEN ........................................................... 20
COURSE DEVIATION INDICATOR (CDI) ...................................................... 21
CLOCK ........................................................................................................... 22
CLOCK SET ................................................................................................... 22
CLOCKALARM.............................................................................................. 22
TIMERS.......................................................................................................... 23
REPROGRAM BOXES ............................................................................................ 23
WAYPOINTS ............................................................................................................ 24
SAVINGYOUR PRESENT POSITION (QUICK SAVE) ...................................... 24
SAVING CURSOR POSITION ............................................................................ 25
SAVINGYOUR PRESENT POSITION................................................................ 25
EDITWAYPOINT LAT/LON ................................................................................. 26
EDITWAYPOINT NAME ..................................................................................... 27
MOVE AWAYPOINT........................................................................................... 27
DISTANCE BETWEENWAYPONTS................................................................... 28
WAYPOINT OPTIONS ........................................................................................ 29
DELETE AWAYPOINT ....................................................................................... 29
ROUTES .................................................................................................................. 30
CREATE A ROUTE............................................................................................. 30
SELECTWAYPOINTS FOR ROUTE ............................................................. 31
FINISHINGTHE ROUTE................................................................................ 32
DELETE AWAYPOINT FROM ROUTE.......................................................... 32
GLOBALNAV 310WAYPOINT DETAIL .......................................................... 32
FOLLOW A ROUTE ............................................................................................ 32
SKIP AWAYPOINT IN A ROUTE................................................................... 34
DELETE A ROUTE............................................................................................. 34

NAVIGATION................................................................................................................. 35
NAVIGATETO AWAYPOINT ................................................................................... 35
NAVIGATETO A CURSOR LOCATION ................................................................... 35
NAVIGATINGTO AWAYPOINT USINGTHE PLOTTER ......................................... 36
CANCELNAVIGATION ............................................................................................ 36
SYSTEMSETUP .......................................................................................................... 37
SPEAKERON/OFF ................................................................................................. 37
CONTRASTADJUST .............................................................................................. 37
UNITS OF MEASURE.............................................................................................. 37
POSITIONFORMAT ................................................................................................ 38
NMEA/DGPS ........................................................................................................... 39
NMEAOUTPUT.................................................................................................. 40
DGPS.................................................................................................................. 40
SERIALCOMMUNICATIONSETUP .................................................................. 42
RESETOPTIONS.................................................................................................... 42
SYSTEMINFO......................................................................................................... 43
GPS SETUP ................................................................................................................. 43
EXECUTE GPS COLD START ................................................................................ 43
DATUM ..................................................................................................................... 44
PCF ....................................................................................................................... 45
POSITIONPINNING ................................................................................................ 46
ALARMS ....................................................................................................................... 46
MESSAGES.................................................................................................................. 47
BACKLIGHT.................................................................................................................. 47
REPROGRAMWINDOW GROUPS ............................................................................. 48
RESETWINDOW GROUPS .................................................................................... 49
SIMULATOR.................................................................................................................. 50
STARTING POSITION ............................................................................................. 50
USER ARROW KEYSTO STEER ........................................................................... 50
DEFINITIONOFTERMS/ABBREVIATIONS................................................................. 51
WINDOW GROUPS...................................................................................................... 52
UPS RETURN SERVICE .............................................................................................. 54
WARRANTY STATEMENT............................................................................................ 56
ANTENNAMODULETEMPLATE ................................................................................. 58
HOWTO OBTAIN SERVICE - INTERNATIONAL.............................INSIDE BACK COVER
HOWTO OBTAIN SERVICE - U.S.A.ONLY ..................................................BACK COVER

1
Congratulations!
You have purchased one of the finest 12-channel GPS receivers Low-
rance®has ever made. With its large LCD screen, easy to use menus,
andoutstanding performance, we thinkyou’llbe happy withyour GlobalNav
310™ for many years.
GPS works from satellites that transmit information to the world at very
high frequencies.One disadvantage to this frequency is that it’s “line-of-
sight”. In other words, the signals don’t bounce around like your local
radio or television. If you don’t have a clear view of the sky, or if you’re
insideametalboatdock or garage,theunitprobablywon’tbeable to pick
up the signals from the satellites.This is common among all GPS receiv-
ers.
Like most GPS receivers, your GlobalNav 310 doesn’t have a compass
or any other navigation aid built into it.It relies solely on the signals from
the satellites to determine its position. Speed, direction of travel, and
distance are all calculated from position information.Therefore, in order
for it to determine the directionyou’retravelling, you must be moving, and
the faster - the better. This is not to say the unit won’t work at walking
speeds - it will. But the faster you travel, the easier it is for the unit to
determine your direction.
Another factor that influences the GPS’ position and navigation capabili-
ties is called selective availability or S/A.This is small errors purposefully
injected into the transmitted signal from the satellites.The government
does this to degrade the system’s accuracy to civilian and foreign users.
Evenwith S/A, GPS is themostaccuratenavigation systemeverinvented
on such a large scale.The Government’s accuracy specification is 100
meters horizontally and 150 meters vertically 95% of the time. In other
words, the position shown on your GlobalNav 310 could be up to 100
meters in any direction from your actual position, and the altitude could
be plus or minus 150 meters from what’s shown on the screen, 95% of
the time.
There are two ways around the S/A problem. One is to have the govern-
ment simply turn it off. In fact, there is growing pressure on them to do
that, but it’s not likely to happen anytime soon. The other method is to
purchaseaDGPSreceiver andconnectittoyour GlobalNav310.A DGPS
receiver (commonly called a beacon receiver), picks up correction sig-
nals broadcast from ground stations. The GlobalNav 310 takes these
corrections and applies them to the position and altitude screens, giving
you much better accuracy.

2
Even with S/A on, and without a DGPS receiver, your GlobalNav 310
gives you outstanding position and navigation information.
Pleasesitdownwiththeunitandthismanualandfamiliarizeyourself with
them before using the GlobalNav 310 in the “real world”. A simulator is
built in, which lets you practice.
INSTALLATION
INSTALLATION - Bracket
YoucaninstalltheGlobalNav310onthetopofadashorfromanoverhead
with the supplied bracket. It can also be installed in the dash with an
optionalIDA-3mountingkit.Aswivelbracketisincludedthatconvertsthe
GlobaNav310'sgimbalbrackettoaswivelmount.Youcanmountitinany
convenientlocation,providedthereisclearancewhenit’stiltedforthebest
viewing angle.
Bracket Installation - No Swivel
Holes in the bracket’s base allow wood screw or through bolt mounting.
It may be necessary to place a piece of plywood on the back side of thin
panels to reinforce the panel. Make certain there is enough room behind
the unit to attach the power and antenna cables.
Drillaholeinthedashforthepowerandantennacables.Thebestlocation
forthisholeisimmediatelyunderthegimbalbracket.Thisway,thebracket
coversthehole.Thesmallestholethepowerandantennacableconnector
can pass through is 3/4". Route the cables to the unit by passing them
throughtheholefromunderthedash.Slidethebracketoverthehole,then
route the cables out the slot in the back of the bracket. Finally, fasten the
bracket to the dash.
Bracket Installation - With Swivel
1. Placetheswivelbracketonthedashorconsoleinthedesiredmounting
location.Makecertainthereisenoughroomfortheunittorotate.Using
theswivelbracket’sbase as a template, mark the four mounting holes
for drilling. Remove the bracket and drill the holes in the mounting
surface for the #10 mounting screws.
2. Installthelargelocknutintothebottomoftheswivelbracket.Placethe
swivel bracket onto the mounting surface and attach it using the four
supplied #10 screws.
3. Pass the large screw through the gimbal bracket and the swivel
bracket. Thread it into the large locknut and tighten it. Don't tighten it
too tight, or the gimbal bracket won't swivel.

3
GimbalBracket
Washer
GimbalKnob
GlobalNav310
AttachtheGlobalNav310tothegimbalbracketusingthesuppliedgimbal
knobs and washers as shown below.

4
WHITE
TO
GLOBALNAV 310
2-AMP
FUSE
GREEN
BLACK
RED
12-VOLT
BATTERY
GLOBALNAV 310
TRANSMIT
(NMEA)
GLOBALNAV 310
RECEIVE
(NMEA)
POWER
The GlobalNav 310 will operate from a 12-volt DC system.(9 to 15 volts
DC.) You can connect the power cable to an accessory buss under the
dash, however, to keep electrical noise interference to a minimum, we
recommend you wire the power cable directly to the battery through the
supplied 2-amp fuse.
CAUTION!
Do not connect this product to a power source without using a fuse!
Failure to use the fuse can cause damage to your unit and will void the
warranty.
Follow the wiring diagram below. If the wires on the power cable are not
long enough to reach the battery, use 18 gauge wire to lengthen the
power cable.
The power cable’s green wire is used to receive data from a DGPS re-
ceiver. The white wire is used to transmit data to a DGPS receiver or
other electronic equipment. If you are not connecting the GlobalNav 310
to another device, tape the ends of these wires and secure them where
they will not short to one another. See the NMEA/DGPS section in this
manual for more information.
(Note:If your power cable has six wires, tape and secure the extra wires,
also.They are not used on this product.)

5
ANTENNA
The GlobalNav 310’s antenna can be mounted on any flat surface, pro-
vided you have access behind the surface for the mounting screws. A
magnet is also supplied that can be epoxied to the bottom of the an-
tenna, allowing it to be used on off-road vehicles. A pole mount adapter
lets you mount the antenna on a pole or swivel mount.
ANTENNA INSTALLATION
Surface Mount
The antenna can be easily installed on any flat surface that is at least 90
mm (3 1/2”) wide.Make certain that a clear view of the sky is available at
the selected location.Since the GPS signals travel “line-of-sight”, nearly
anything blocking the antenna can potentially obstruct the unit from find-
ing a satellite.
Onceyou’ve determinedthemountinglocation, use the templateonpage
51 in this manual to drill the holes for the screws.The screws, supplied
with the GlobalNav 310, are 4mm x 30mm. (about 1 1/8” long). Drill 4.75
mm (3/16”) holes for the mounting screws. If you route the cable through
the mounting surface, you’ll need to drill a 25 mm (1”) hole for the cable.
There is a notch in the antenna housing that allows the cable to pass
through to the outside, instead of routing it through the mounting surface.

6
After drilling the holes, pass the o-ring over the antenna cable and press
it into the groove on the bottom of the antenna housing. Now attach the
antenna to the mounting surface, using 4mm screws and the supplied
lock washers. Route the cable to the GlobalNav 310 and the antenna
installation is finished.
Magnet Mount
A magnet lets you temporarily mount the antenna on any ferrous metal
surface.(such as a car)To use the magnet, simply epoxy it to the bottom
of the antenna, using the epoxy supplied with your GlobalNav 310.Care-
fully follow the instructions on the epoxy package and apply it to the
magnet.Then carefully press the magnet to the bottom of the antenna
housing. After the epoxy cures (in about 30 minutes), the antenna is
ready for use.
MAGNET
Pole Mount
The antenna attaches to the pole mount
adapterwiththesupplied 4mmscrews.You
can route the antenna cable through the
slot in the side of the antenna, or pass it
down through the pole mount adapter. A
slot next to the threads in the pole mount
adapter places the cable next to the pole
whereitcanbeeasilyrouteddownthepole
to the GlobalNav 310.The threads on the
pole mount adapter accept a standard
marine antenna mount.
POLEMOUNT

7
KEYBOARD
The keyboard has twelve keys. The arrow keys are tied to most of the
features, letting you easily move the plotter’s cursor, navigate through
the menus, make selections from menus, and other tasks.
TheWPT key lets you create, save, and recall waypoints and routes.The
MODE key switches the unit between the three major displays:windows,
navigation, and plotter. To select different features, or to modify func-
tions,presstheMENUkey.The Z-IN and Z-OUT keys zoom-in and zoom-
out your view on the plotter screen.The ENT and EXIT keys let you enter
or erase selections.The PWR key turns the GlobalNav 310 on and off.
Note:To prevent an accidental power shutdown, you must hold the PWR
key down for a few seconds in order to turn the unit off.
Z-IN
Z-OUT
MODE
MENU
WPT
EXIT
ENT
PWR

8
OPERATION
Turning Power On
To turn the GlobalNav 310 on, simply
press the PWR key. A screen similar to
the one at right appears. Read the mes-
sageonthescreen,thenpress the EXIT
keytoeraseit.TheGlobalNav310isnow
ready for use.
MENUS
Most of the Lowrance View’s adjustments and features are found on
“menus”.Pressingthe MENUkey letsyouviewthemenus.Differentmenus
itemsareaddedtothe basiclist,depend-
ing on which mode (plotter, navigation,
or windows) the unit is in.This gives you
thefeaturesthatarespecificto the mode
you are in, but also has items that are
used on all modes.
Using the arrow keys moves the black
box to highlight different menus on the
list.Pressing the right arrow key selects
the menu.
To erase a menu, press the EXIT key.
FindingYour Position
Cold Start
When the GlobalNav 310 is turned on for the very first time, it doesn’t
know where it is, nor what the local time or date is. If you tell it your
position, time, and date, the unit will take much less time to lock-on to the
satellites and give you a fix or position.
However, if you don’t want to push buttons at this time, that’s fine. The
GlobalNav 310 will lock onto the satellites and give you a position without
any input from you.This is called a “cold-start”. It simply means that the
unit is searching without help for the satellites that are in orbit. A cold-
start can take up to 2 minutes to acquire enough satellite data to deter-
mine your position, although it typically takes less time than that.

9
Once it locks on to the satellites and finds your position, it stores the
satellite data in its memory.The next time you use the unit, it should take
much less time to lock on.
To use your GlobalNav 310, first make certain you have a clear view of
the sky, free from any obstructions such as trees, carport, or a covered
boat dock.
Press the PWR key. Read the message
on the screen, then press the EXIT key
to erase the message.A screen similar
to the one at right appears.
This is windows group “A”. Your track
(TRK), or direction of travel is shown in
the upper right corner of this screen.
Bearing to a waypoint (BRG), Course
over ground (CRS), and cross track er-
ror (XTK) are all shown on this screen.You must recall a waypoint to use
the bearing, course, and cross track error windows. As you wait for it to
find your position, you’ll see numbers flashing on the display. Anytime
you see flashing numbers, it means the GlobalNav 310 does not have a
position! Do not rely on any data that is flashing!When the numbers stop
flashing, the unit has locked on to the satellites and the position is good.
That’s all you have to do to find your position.All time displays may not be
correct when the cold start method is used.See the initialization section
for details on changing the time.
FindingYour Position
Initialization
A cold-start as described above can take over 5 minutes to find your
position. A faster method is to initialize the GlobalNav 310 manually. To
do this, first press the PWR key. Next,
read the messages on the screen and
press the EXIT key to erase them.Now
press the MENU key.
Press the up or down arrow keys until
the “GPS SETUP” menu is highlighted
as shown at right. Now press the right
arrow key.The screen shown at the top
of the next page appears.

10
Using the down arrow key, highlight the
“Initialize GPS Receiver” menu, then
press the right arrow key. The screen
shown below appears.
ThisistheGPSinitializationscreen.The
position, altitude, time, and date the
GlobalNav 310 is currently using to find
the satellites is shown at the bottom of
this screen. Changing these values to
your local position and time will speed
the position lock.
To change the position, press the right
arrow key while the“EDITLAT/LON”box
ishighlighted.Thescreenshown at right
appears.
If your latitude is south, press the up or
downarrowkey to changeit.If itisnorth,
press the right arrow key to move the
change box to the first number in the latitude. Now press the up arrow
key to increase the number or the down arrow key to decrease it.Once
the first number in the latitude is set,
press the right arrow key once to move
to the next number in the latitude.
Keep pressing the arrow keys until the
latitude and longitude are set to your lo-
calposition.(Note:This positiondoesnot
have to be very accurate.If you can get
it within one degree of your actual posi-
tion,thatwillbefine.)Whenit’sset,press
theENTkey.TheGlobalNav 310accepts
your entry and returns to the GPS setup menu.

11
Now change the local time and date if
they’re incorrect on this screen. (Don’t
worry about altitude.) When everything
isacceptable,presstheEXITkey repeat-
edly to return to a mode screen. The
GlobalNav310willinstantlyuse thedata
you entered to find the satellites in the
sky.(The unit knows which satellites will
be available at the position, date, and
time you entered.Therefore, it will only
look for those satellites, making the search time much shorter than a
cold start which looks for all of the satellites until it finds three.)
Once the GlobalNav 310 finds and locks on to three satellites, it stops
flashing the numbers on the display.(Note:Altitude will still flash until the
unit locks on to the fourth satellite. It takes four satellites to determine
altitude.)
IMPORTANT!
If the data shown in digital numbers on any screen is flashing, it
meansthatdataisinvalid.DO NOTRELY ON ANY NUMBERSTHAT
ARE FLASHING! Usually, this happens when the GlobalNav 310
has lost its lock on the satellites. The data that is flashing was the
last known when the unit lost its navigational capability.
DO NOT NAVIGATE WITH THIS UNIT UNTIL THE DATA STOPS
FLASHING!
POSITION/NAVIGATION DISPLAYS
The GlobalNav 310 has navigation, plotter, and windows group modes.
These screens were designed to show
data that is used most often.
The three default displays are shown on
the next page.To change displays, sim-
ply press the MODE key. A screen simi-
lartothe oneatrightappears.Nowpress
the up or down arrow keys to change
modes. (The windows display is shown

12
as "GRP" (groups). For example, Group A is the first windows group on
the MODE menu.) Press the right arrow key to see more screens on
each mode. When the desired screen appears, press the EXIT key to
clear the menu.
Note:For a list of abbreviations used on the displays, see the back of this
manual.
Navigation Screens
Therearetwonavigationscreens.Navscreennumberoneshows agraphi-
cal view of your trip, the other screen shows all navigation details in large
digitalnumbers.Youcancustomize the navigation screens toshowdiffer-
entdatathantheoneschosenbyLowrance.See the“Customize Screen”
section for more details.
Nav Screen #1
This screen is dominated by a compass rose (See the screen at the top
of the next page.)Your position is in the center of the circle, designated
by an arrow that always points straight up.Your track (direction of travel)
is indicated by an arrow pointing down toward the compass rose at the
top center of the screen.Your track in digital numbers is also shown to the
right of the arrow.On the screen at the top of the next page, the track is
NAV-1 PLOT-1
GROUP A

13
348°.The line extending behind the ar-
row in the center shows your track his-
tory, or path you’ve travelled.
Your speed over ground or Ground
Speed (GS) shows in the digital box to
the right of the circle.
The screen looks like this when you’re
not navigating to a waypoint.(See page
35 for information on waypoint naviga-
tion.) If you navigate to a waypoint, the
screen looks like the one below.
The bearing to the destination waypoint
is shown in the upper left corner of the
screen. Bearing is also shown by the
large arrow pointing up to the compass.
The lines on either side of the present
position arrow show the cross track er-
ror range. In other words, (using the
screen above as an example) if the ar-
row crosses the line on either side, you
are .10 miles to the left or right of the
desired course.
A circle depicting your destination ap-
pearsonthescreen asyou approach the
waypoint.
The digital boxes on the screen’s right
side show (from top to bottom) your dis-
tance to go to the destination (DIS), ground speed (GS), estimated time
en route (ETE), and course (CRS).
Course (CRS) is the bearing from your starting location to your destina-
tion. (Remember, course has nothing to do with your present position,
except for your starting location.) It’s shown as a dotted line on the NAV
1 display. This is shown as a reminder so that if you deviate from your
original course, you can easily return to it.(A“course”is a proposed path
over the ground.A “track” is your actual path over ground.)

14
Nav Screen #2
Thenavigation screen shows navigation
information in large digital numbers. To
view this screen, press the MODE key,
then press the up arrow key until the
black box surrounds the “NAV 1” label.
Now press the right arrow key.A screen
similartotheoneatrightappears.Press
the EXIT key to erase the mode menu.
This screen is composed of eight digital display boxes, showing your
track (TRK), and ground speed (GS).The other boxes show navigation
datawhena waypoint isrecalled,includingbearingtothe waypoint(BRG),
course (CRS), Altitude (ALT), distance to waypoint (DIS), velocity made
good (VMG), and cross track error (XTK).
Plotter
The plotter lets you see your course and track from a “birds-eye”view. If
you’ve recalledawaypoint, theplottershow your staring location,present
position, and destination.However, you don’t have to recall a waypoint to
use the plotter.
To use the plotter, simply press the
MODE key, then press the up or down
arrow keys until the “Plot” label is
higlighted. Press the EXIT key to erase
the mode menu.A screen similar to the
one at right appears.This is plot-1.The
diamond flashing in the center of the
screenisyourpresentposition.Thesolid
line extending from the diamond is your
track, or path you’ve travelled. The
plotter’s range is shown in the lower left corner of the screen. In this
example, the plotter’s range is two miles from the left edge of the screen
to the right.
There are two different plotter screens
available. Map screen number 1 shows
by default.Your current position displays
at the center of the screen by a cross
surrounded by a flashing diamond.
To view the other plotter screen, press
the MODE key.Press the up or down ar-

15
row key to move the black box to the "PLOT" label. Now press the right
arrow or left arrow key to select plot 2. This screen (as shown at the
bottom of the previous page) has navigation data displayed on the right
side of the screen in digital numbers.This data is active whenever you’ve
recalled a waypoint. Press the EXIT key to erase the mode menu.
This screen shows ground speed (GS), track (TRK), course (CRS), and
cross track error (XTK).
Use the Z-IN and Z-OUT keys to enlarge or reduce the plotter area.This
changes the plotter’s range.The available ranges are:0.1, 0.15, 0.2, 0.3,
0.4, 0.6, 0.8, 1, 1.5, 2, 3, 4, 5, 6, 8, 10, 15, 20, 30, 40, 60, 80, 100,150,
200, 300, 400, 600, 800, 1000, 1500, 2000, 3000, and 4000 miles.
Cursor
Pressing an arrow key while the plotter
is on shows two dotted lines that inter-
sect at your present position.These dot-
ted lines are called a “cursor” and have
a variety of uses.
Youcanmove the cursor around the dis-
play by pressing the arrow keys in the
direction you want it to move. This lets
you view different areas of the plotter,
away from your present position. When
it’s turned on, the zoom-in and zoom-out keys work from the cursor’s
position - not the present position, so you can zoom in on any detail,
anywhere while navigating.The latitude/longitude of the cursor shows in
the box at the top of the plot-1 screen whenever the cursor is activated.
The cursor is also used to place and erase icons and waypoints.
Press the EXIT key to erase the cursor.
PLOTTER OPTIONS
The GlobalNav 310 lets you customize
the plotter using the “plotter options”
menu.To use this menu, first press the
MENU key, then use the up or down ar-
row keys to highlight the “Plotter Opts”
label.Finally, press the right arrow key.
The screen shown at right appears.

16
RecordTrail On / Off
The line extending from the present po-
sition diamond on the plotter is call the
plot trail. As each dot on the trail is
placed on the screen, it’s also saved in
memory.The plot trail recording can be
turned off, if desired.To turn it off, press
the up or down arrow key until the
“Record Trail” menu is highlighted and
press the left arrow key.Press the EXIT
key to return to the main menu.
Clear Current Plot Trail
To erase the plot trail extending from your present position, highlight the
“ClearPlot Trail” menu, then press the right arrow key. A message box
appears, asking you if you really want to erase the plot trail. Follow the
directions on this message box.The GlobalNav 310 returns to the plotter
screen after the message box clears.
Plotter Orientation
Normally, the GlobalNav 310 shows the plotter with north always at the
top of the screen.This is the way most maps and charts are printed on
paper.This is fine if you’re always travelling due north.Waypoints you see
to your left corresponds to the left side of the plotter, to your right is
shown on the right side of the plotter, and so on.
However, if you travel any other direction, the plotter doesn’t line up with
your view of the world.
To correct this problem, this unit has a track-up mode that rotates the
plotter as you turn. Thus, what you see on the left side of the screen
should always be to your left, and so on. It also has a course-up mode
that keeps the plotter at the same orientation as your initial bearing to the
waypoint.
In the examples shown at right and on
thenext page,we'retravelling southeast
(about 210° magnetic). In the north-up
view (at right), the present position indi-
cator appearsto move towardsthe lower
leftcornerofthe screen.The anchoricon
shown on the left side of the screen is
actually on our right. North is always at
the top center of this screen. NORTH-UP MODE