Garmin GPS Map 76 User manual

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Appendix B
The Garmin GPS Map 76 Receiver: Features, Functions,
Setup, and Quality of Position
Garmin GPS Map76 Features
Specifications
Weight: 7.5 ounces
No. channels: 12 parallel
Antenna type: Quad Helix
Display size: 180 x 240 pixels
Included map base: North America major highways, cities, exits –accepts optional
Map Source ™ enhanced maps
No. Waypoints: 500 with name and graphical symbol
No. Tracks: 10 saved, about 10,000 total track points, auto logging
No. Routes: 50 comprised of 50 waypoints each
Rugged standard: IPX 7 waterproof –floats on surface!
Other features: Trip computer, tidal info, sun/moon info, hunting/fishing info
Manual, pg. 4 and: http://www.garmin.com/products/gpsmap76/spec.html.
GPS Map 76 –Front View
Visible on the front side of the Map76 is the:
Antenna –always hold the receiver upright with the display facing you and the
antenna at about an 80 degree angle from horizontal. Face towards the southwest to
obtain the best GPS reception.
Screen protector –Provides international patent information and a reminder of how to
orient the receiver for best GPS satellite reception.
Keypad –A ROCKER key surrounded by 8 functional keys.
Display –Display capable of depicting GPS data and 4 grey color maps.

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GPS Map 76 –Back View
On the back side of the Map 76 you will find: 1. The antenna port, 2. The battery
compartment, and 3. The power-data port.
You can connect an external antenna with an MCX connector to the antenna port.

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Connect the antenna by grasping the MCX connector between your thumb and index
finger and gently pushing the connector straight into the port. Remove the connector by
gently pulling it straight out. Never twist the connector while inserting it into or
removing it from the port.
The battery compartment is found in the middle of the receiver. Lift, twist, and pull
the D-ring to remove the flap covering both the battery compartment and the
power/data port. Be sure batteries are oriented according to the guides etched on the
inside of the compartment. Use two fresh AA batteries from the same pack each time
you change batteries.
The power/data port is located near the bottom of the back side –insert Garmin
power adapter or PC data 4-pin plugs by aligning the slot on the plug with the raised
key on the inner wall of the port.
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Map 76 Interface Keys
POWER/backlight key (light bulb) –Press and hold to power up the Map76. Press
again to activate the backlight.
QUIT –Press this key to exit a function or go back a page.
NAV (MOB) –Press this key to begin navigation function. When the NAV key is
pressed and held it records a Man Overboard (MOB) point that stores the current
location and commences navigation back to that point.
ZOOM IN –Press this key while viewing a map to zoom in (enlarge).
ZOOM OUT –Press this key while viewing a map to zoom out (reduce).
PAGE –Press this key to move between primary display pages.
MENU –Press this key twice to access the main menu. Press once to display page
option menus.
ENTER –Press this key to activate a data field or confirm a selection. Press and hold
to capture a waypoint.
ROCKER –Use this key to move between fields and between field place holders
within fields. The ROCKER key moves left, right, up, and down.
ROCKER Key
The ROCKER key is used to move from scroll up and down lists in menus.
It is also used to move from field to field on a setup page.
Individual settings can be adjusted by pressing the ENTER key to activate a field then
pressing left/right ROCKER to move left or right - character to character.
Pressing up/down ROCKER lets you change a number or letter for a particular
character entry.
See Manual, pg. 10.
POWER Key, First Press
Press and hold the POWER key (red light bulb icon on left side of the keypad) until
you see the first startup page.
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Press the ENTER key to move through the startup pages to the GPS Information
page.
Startup Pages 1 and 2 contain proprietary and copyright information.
Startup Page 3 is a warning and legal disclaimer. See Manual, pg. 10.
POWER Key, Second Press
Press the POWER key a second time to adjust backlight and display contrast.
Warning –turning on the backlight drains the battery!
Warning –Do not change the contrast! Doing so may cause display loss and force a
system reset!
Use the ROCKER key to adjust the „sliders‟ for backlight.
Use the QUIT key to accept the setting or exit the adjustment.
Other setups affect how long the backlight stays on.
POWER Key, Turn off Map 76
Turn off the Map76 by pressing the POWER key and holding until off. See Manual, Pg.
10.

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MENU Key, First Press
Press the MENU key to see a list of the options. Use the ROCKER key to scroll to and
highlight an option then press the ENTER key to select an option:
Start Simulator –Select this option to place the Map76 in simulator mode.
North Up (Track Up) –Select this option to display North up in the satellite view or
change to have North in same direction as track.
New Elevation –Enter a better elevation to improve 3D performance.
New Location –Select this option if the receiver has been moved more than 100
miles. Choose the „Automatic‟ option to have the receiver search the sky for
satellites or select „Use Map‟ to help it figure out where in the world it is. The „Use
Map‟ option allows you to move the pointer on the Map page to a location.
See Manual, pg. 10.
MENU Key, Second Press
Press the MENU key a second time to see the Main Menu page.
NAV Key, First Press
Press the NAV key to see a list of the options.
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Use the ROCKER key to choose an option. Press the ENTER key to select an option:
Go To Point –Set the Map76 to navigate to a specific waypoint.
Navigate Route –Set the Map76 to navigate using a specific route (collection of
related waypoints).
Navigate Track –Set the Map76 to navigate along a specific track (a denser
collection of points, or a bread-crumb trail)
Resume Navigation –Set the Map76 back to navigation mode after it‟s been stopped.
Uses last navigation setting (point, route, and track).
NAV Key, Second Press
Press the NAV key a second time to set a “Man Overboard” (MOB) point.
The MOB, once set, allows the Map76 to provide navigation directions back to that spot.
A good example is setting the location of a vehicle prior to entering thick woods then
navigating back to the vehicle.
See Manual, Pg. 10.
ENTER Key
Press the ENTER key to accept a choice highlighted by the ROCKER key.
Press and hold the ENTER key to mark a waypoint.
See Manual, pg. 10.
PAGE Key
Use the PAGE key to move among the five main display pages of the Map 76.
Map 76 Main Display Pages
The Map 76 has five main display pages:
GPS Information Page

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Map Page
Point Page
Highway Page
Route (or GoTo) page
The GPS Information page
Displays speed, elevation, accuracy, receiver status, satellite status, date, time, and
location.
When the receiver receives 3 satellite signals it will report accuracy (estimated) and
speed. When it‟s receiving 4 satellites it will report elevation.
The Map76 displays several types of receiver status messages:
o2D location –computing horizontal position based on 3 satellites.
o3D location –computing horizontal and vertical position based on 4 or more
satellites.
o2D/3D differential location –computing positions using WAAS or other
differential corrections.
oSimulating GPS –the receiver is running in simulator mode and is not receiving
GPS signals.
Satellite sky view –shows location of satellites in sky relative to location (in center)
of receiver. Satellites being tracked are plotted.
Satellite strength indicators bars display which satellites are being tracked and what
their relative strength is. Satellites used for navigation will be solid black. A “D” in
any given bar indicates presence of differential corrections.
You can toggle between a set coordinate system, such as UTM, and
degrees/minutes/seconds by toggling the ROCKER key up/down.
See Manual, Pgs. 23 & 24.
The Map Page

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The Map76 comes with a built-in base map of North America that includes cities,
interstate highways, and state/county roads. The scale of the map data is
approximately 1:2,000,000.
Supplemental map data can be uploaded to the Map76 from the Map Source Topo ™
software that comes with Configuration 1 & 2 systems. Map Source Topo data are
approximately 1:100,000 scale.
Other Map Source software can be obtained from Garmin or Garmin dealers:
http://www.garmin.com/cartography/mapsource/
Change the zoom scale by using the zoom keys on the Map76 keypad
oZOOM IN
oZOOM OUT
A scale bar is displayed in the lower left corner of the map.
If „Overzoom‟ is displayed under the scale no further map information is available.
Map Page Zoom In/Out
Use the ZOOM IN key to zoom in on the map display. Note the scale change in the
lower left corner of the map.
Use the ZOOM OUT key to zoom out on the map display.
If „Overzoom‟ is displayed no further map information can be displayed.
The „mapsource‟ beneath the scale bar indicates Map Source ™ enhanced map data is
loaded and can be viewed.
See Manual, Pg. 26.
Map Page Options –Change Page Layout
Press the MENU key while on the map page

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Use the ROCKER key to scroll to Setup Page Layout. When the option is highlighted
press the ENTER key.
Another choice list pops up. Use the ROCKER key to move up/down the list. When
the option desired is highlighted (in this case Small (1 Row)) then press the ENTER
key.
The map display changes to conform to your selection.
See Manual, pg. 27.
Map Page Options –Change Data Fields
While on the map page press the MENU key. A choice list pops up.
Scroll to Change Data Fields. Once highlighted press the ENTER key.

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You will see the top left most data field highlighted. Press the ENTER key to change
the type of data displayed in the field.
Use the ROCKER key to scroll up/down the choice list that pops up.
When the desired data type is highlighted press the ENTER key.
Use the ROCKER key to scroll to a different data field.
See Manual, pg. 27.

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Pointer Page (use with NAV key)
The pointer page is used for navigation when a straight line course can not be
followed.
The pointer page has:
°User selectable data fields
°Status bar (indicates which point being navigated)
°Compass ring (graphic display of current track)
°Pointer (points towards active waypoint)
After a waypoint is made active for navigation the waypoint name is displayed in the
status bar. As you change direction the compass ring will rotate –aligning your track
with the vertical line. As you change direction the pointer will always point toward
the active navigation waypoint.
When you are going directly toward the active waypoint the pointer is aligned with
the vertical line in the compass ring.
When you arrive at the waypoint an „Arriving at Destination‟ message will be
displayed.
The compass ring is not a true compass –you must be moving for the pointer and
compass ring to work properly.
See Manual, pg. 33.
Highway Page (use with NAV key)
Used when a straight line course can be followed.
The page has user selectable data fields, a status bar, and a highway display.
Tracks and waypoints displayed on the map page will be present on the highway
page.
The triangle represents current location relative to the active waypoint or track.

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Like the map page, the zoom level can be changed by using the ZOOM IN/OUT
keys.
Navigate down the highway by keeping the point of the triangle aligned with the
white line in the highway and the highway pointed towards the top of the display.
Press the MENU key to access the highway page options. Options are adjusted much
as they are on the map page.
See Manual, Pgs. 34-36.
Active Route Page
The route page is the third navigation display page.
A route is a series of waypoints that have been selected for navigation.
The navigation is point to point and follows a list that the user designates.
When we choose a list of waypoints a name will be assigned in the top field.
Each waypoint chosen is displayed.
Immediately to the right of the waypoint is a data field.
The data field provides real time status to the route navigator.
Status fields include Distance, Course, and ETA.
A route distance total is displayed in the lower right field.
See Manual Pg. 36.
Active Goto Page
When a single waypoint is being navigated the top of the page will read “Active
Goto”instead of “Active Route”. The navigation waypoint will be listed.
The distance to the point is displayed.
Pressing the ROCKER key to the right or left cycles following additional data
displayed on the right side of the screen for route and waypoint navigation:
°Leg fuel

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°Leg time Leg distance (must be moving)
°Sunrise
°Sunset
°Time to (next point –estimate improves when moving)
°Distance
°Course –direction between the active „from‟ and „to‟ waypoints.
°ETA ( Estimated Time of Arrival –estimated time you will reach your destination
waypoint based on current course and speed)
°Fuel (must be moving)
See Manual Pg. 36
GPS Map 76 Setup
Turning on the Map 76 and Placing in Simulator Mode
Press and hold the POWER key until the first screen appears.
Press the ENTER key until the GPS Info Page appears.
Press the MENU key, and then use the ROCKER key to scroll to “Start Simulator”.
Press the ENTER key to start simulator.
The Status Bar will read “SIMULATOR”.
Main Menu
The Main Menu Page contains settings not found on the Main pages.
It can be accessed from any page by pressing the MENU key twice.
Three status fields: Backlight status, Memory status, and Power status are found at
the bottom of the Main Menu page.
The backlight status tells you if the backlight is turned on.
This is important because the backlight is a major source of battery drain.

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The memory indicator gauge at the bottom center of the page tells you how much
memory is available for waypoints and tracks.
A battery in the lower right corner tells you the unit is operating on battery power
only.
The battery symbol works like a gauge –you can see how much power is left by
seeing how “full” the battery is (darkened area).
A plug in the lower right corner means the Map76 is connected to and powered by an
external power source.
There is no way to know how “full” an external battery is by looking at this icon.
See Manual Pg. 37.
Accessing the Setup Menu
Scroll down the Menu page until “Setup” is highlighted, then press the ENTER key.
You will be taken to the first setup tab.
Making changes to settings
Use the ROCKER key to move to an option field, then press the ENTER key to
access the options for that field.
Use the ROCKER key to scroll through choice lists then press ENTER to lock in the
choice.
Press ENTER on a numeric field to enable editing. Use the ROCKER key to scroll
up and down lists of integers.
Press ENTER to lock in the integer choice.
See Manual Pg. 56.
General Tab Options
The „General Tab‟ has settings for the receiver Mode, WAAS, Backlight Timeout, and
Beeper.

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Mode field
Normal Mode is the default setting and tracks satellites, computes Position, Velocity,
and Time (PVT).
Battery Saver mode optimizes receiver to save battery power (slower screen updates)
Simulator mode turns off the GPS tracking and uses a small time slice of prior
acquired data.
WAAS field
Enabled –receiver searches for a WAAS satellite and signal, processes corrections, and
applies the corrections to PVT. When corrections are being received and processed a
“D” will appear in the signal strength bars on the GPS Info Page.
Disabled –WAAS corrections are not being received, processed, and applied to PVT.
WAAS satellites orbit the equator at 24,000 miles out so they will be low on the horizon.
You must have an unobstructed view of the sky (no canopy, no buildings) for the Map76
to utilize WAAS.
If you want to use WAAS you should do the following to further optimize reception:
If you are in the Western U.S. then face due south, hold the receiver with your arm
outstretched, and raise the position of the receiver until it is 45° to 65° from
horizontal.
If you are in the Central U.S. then face southeast or southwest, hold the receiver with
your arm outstretched, and raise the position of the receiver until it is 45° to 65° from
horizontal.
If you are in the Eastern U.S. then face southeast or southwest, hold the receiver with
your arm outstretched, and raise the position of the receiver until it is 45° to 65° from
horizontal.
Backlight Timeout field
Use the ROCKER key to scroll through the choices.
Press ENTER to select and lock in a choice.

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Warning –excessive backlight will rapidly drain batteries!
Beeper field
Provides audible (and annoying) beeping sound when keys are pressed and messages
pop up.
Use the ROCKER key to select choice, then Press ENTER key to lock in the choice.
Although annoying beginners will find it‟s easier to know and see what‟s going on
with the receiver if the beeper is left fully on.
Time Tab Options
The „Time‟ tab has options for setting Time Format, Time Zone, Daylight Savings Time,
Current Date, and Current Time. Use the ROCKER key to moved to an option field, then
press the ENTER key to access the options for that field.
Time Format field
Set the Map76 to display time in 12 hour or 24 hour (military) format.

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Time Zone field
Use the ROCKER key to scroll through a choice list of time zones. Select “Other” then
choose a UTC (Universal Time Coordinated, or Greenwich Mean Time (GMT)) offset.
You will have to reset the time zone when you operate the Map 76 in a different time
zone.
Daylight Savings Time field
Use the ROCKER key to scroll through a choice of Auto, Yes, or No. Auto uses the GPS
calendar to determine DST for a given location in the U.S.
If “Yes” is chosen then DST is displayed for the location. If “No” is chosen then DST is
not displayed. If Time Zone “Other” is chosen then DST will not be displayed at all.
Current Date field
Determined from the GPS signal from space and is not accessible by users.
Current Time field
Determined from the GPS signal from space and is not accessible by users.
Units Tab Options

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The Units tab contains settings for Elevation, Depth, Distance/Speed, Temperature,
Direction Display, and Speed Filter.
These settings are used in related data fields throughout the unit.
Elevation –Choose from Feet or Meters in height above Mean Sea Level.
Depth –Choose from Feet, Fathoms (one fathom equals six feet), or Meters for depth
below sea level.
The depth input comes from a depth sounding device that outputs National Marine
Electronic Association (NMEA) sentences.
Not relevant to most NRCS activities.
Distance and Speed –Choose from Nautical, Statute (English), or Meters. This setting
will be used in all data fields relating to speed or distance.
Temperature –Choose from Fahrenheit (English) or Celsius (Metric) degrees. The
Map76 accepts NMEA formatted temperature data from over-the-side instruments. Not
really relevant to NRCS programs and activities.
Direction Display –Choose from Cardinal Letters or Numeric Degrees.
This setting will be used in all data fields relating to direction in the receiver.
Mils are another type of angular unit. One degree equals 0.05625 mils.

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Recommended –Set this field to “Numeric Degrees”.
Speed Filter –Choose from Auto or User. The User setting will average the speed and
heading at the rate specified in the time (seconds) setting.
The receiver provides faster updates of PVT when the speed filter is set lower.
See Manual Pg. 58.
Location Tab Options
Location tab contains the settings for Location Format, Map Datum, North Reference,
and Magnetic Variation.
The settings are used in related data fields throughout the receiver.