Garmin GPS III - Manual (Page 36)

EPE and DOP
The Satellite Status Page also indicates the accuracy of the position fix, using
Estimated Position Error (EPE) and Dilution of Precision (DOP) figures. DOP mea-
sures satellite geometry quality (i.e., number of satellites received and where they are
relative to each other) on a scale from one to ten. The lowest numbers are the best
accuracy and the highest numbers are the worst. EPE uses DOP and other factors to
calculate a horizontal position error, in feet or meters.
Screen Backlighting
The GPS III’s backlight feature illuminates the display and keypad for a user-
defined interval (the default is 15 seconds) after the last key press. There are three
stages of backlighting. When backlighting is on, a bulb icon will appear at the bot-
tom left of the sky view. To adjust the duration of the screen backlighting, refer to
the operation setup section (see p. 69).
To turn the screen backlighting on:
1. Cycle through the three levels of backlight by repeatedly pressing the red power key.
To turn the screen backlighting off:
1. Press the red power key. Whenever the GPS III’s backlighting is off, the bulb icon dis-
appears from the Satellite Status Page.
Satellite Status Page Options
Many features of the GPS III are menu driven. Each of the main pages has an
options menu, allowing you to custom tailor the corresponding page to your prefer-
ences and/or select special features which specifically relate to that page.
To display the Satellite Status Page Options, press MENU (with the
Satellite Status Page displayed).
When screen backlighting is
on, a bulb icon will appear in
the lower-left corner of the
Satellite Status Page.
The Satellite Status Page
Options allow you to enable
the built-in simulator, change
the sky view orientation or
initialize the receiver.
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REFERENCE
Satellite Status Page
GPS III A 7/21/98 8:51 AM Page 28