DeLorme Earthmate PN-40 User Manual page 16

Notes:
• You can disable the
GPS using the Device
Setup>System menu option.
Select Disable GPS from
the GPS Settings drop-
down list.
• When GPS has been
disabled, you can enable it
by pressing MENU and then
selecting Enable GPS.
• GPS is temporarily disabled
when in simulate mode (dur-
ing track playback, navigation
simulation, and so on).
• If the Earthmate PN-40 is
unable to acquire a fix after
approximately ten minutes,
you will be prompted to
disable the GPS or continue
searching for satellites.
14
• One red bar—Three quarters of the battery power has been used. Once the battery has
reached 5% of its total battery power, a low battery warning displays.
While the Li-Ion battery is charging, the battery indicator graphic is animated and the word
"Battery" is replaced with "Charging." Once the battery is fully charged, the battery indicator
graphic displays four static green bars and the word "Charging" is replaced with "External" until the
charging cable is removed.
Calibrating Sensors
Changes in weather patterns and geographic locations can cause errors in sensor readings.
Calibrating the sensors ensures that they record and display accurate data in the track file. The
Calibrate menu option is available from the the Satellite Page, the Compass Page and the Device
Setup>Compass & Altimeter menu option. You can also use the Compass & Altimeter menu on the
Device Setup Page to disable the electronic compass and the barometric altimeter, as well as the
auto calibrate altimeter feature. For more information, see To Modify the Compass and Altimeter
Settings on page 72.
To Calibrate the Altimeter
There are three options for manually calibrating the altimeter. Units are based on your device
settings. By default, the device is set to auto calibrate the altimeter using GPS elevation; however,
manual calibration using the known elevation or barometric pressure provides greater accuracy.
If the device is automatically calibrating, "Calibrating" appears in the bottom right corner of the
Satellites Page and a red exclamation point displays in the Elevation: Altimeter info field.
1. From the Satellite Page or the Compass Page press MENU.
OR
From the Device Setup Page, use the arrow keypad to highlight Compass & Altimeter and
press ENTER.
2. Use the arrow keypad to highlight Calibrate and press ENTER.
3. Highlight Calibrate Altimeter and press ENTER.
4. Highlight a calibration method and press ENTER:
• Known Elevation—The elevation at your location. Units are based on your device settings.
With the elevation field highlighted, press ENTER. Use the arrow keypad to highlight the part