Calibrating Sensors; To Calibrate The Altimeter - DeLorme Earthmate PN-40 User Manual

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 Satellite Page and the Compass Page. You can 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 70.

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.
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
of the field you want to change. Press the arrow keypad up or down to change it. When
finished entering the elevation, press ENTER, highlight Calibrate, and then press ENTER.
• Known Pressure—The barometric pressure (adjusted for sea level) for your location.
With the pressure field highlighted, press ENTER. Use the arrow keypad to highlight the part
of the field you want to change. Press the arrow keypad up or down to change it. When
The Satellites Page
Notes:
• You can also 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 see the following
message, "Would you like to
disable the GPS or continue
searching for satellites?"
Select Disable to disable
GPS or Continue to allow
the Earthmate PN-40 to keep
searching for satellites.
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