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GPSMAP 400/500 Series Owner’s Manual 
5
Getting Started 
Using the Keypad
POWER/ 
BACKLIGHT
MENU
ROCKER
SELECT
HOME
RANGE (-/+)
MARK
POwER/baCKLigHT—Press and hold to turn the unit on or off. 
Press and release to adjust the backlight and day and night modes.
RaNgE (-/+)—Press to adjust the range of the sonar. Press to zoom 
in or out on a chart. Press to page up or down on lists.
ROCKER—Press to adjust the range of the sonar, to zoom in or out 
on a chart, to page up or down on lists, to scroll the map, or to adjust 
the backlight level.
MaRK—Press to mark a waypoint at your current location.
SELECT—Press to select highlighted items.
HOME—Press to return to the Home screen.
MENU—Press to access additional settings and configuration 
options. Press to return to the previous screen when indicated.
Acquiring GPS Satellite Signals
When you turn on the unit, the GPS receiver must collect satellite 
data and establish the current location. When the unit acquires 
satellite signals, the signal strength bars at the top of the Home 
screen are green 
. When the unit loses satellite signals, the 
green bars disappear 
 and the position icon displays a flashing 
question mark.
For more information about GPS, visit the Garmin Web site at  
Using Simulator Mode
Simulator mode turns the GPS receiver off for use indoors or for 
practice. The unit does not track satellites in simulator mode.
 WArnInG
Do not try to navigate using simulator mode, because the GPS 
receiver is turned off. Any satellite signal-strength bars shown are 
only simulations and do not represent the strength of actual satellite 
signals.