Lowrance electronic AirMap 1000 - Manual (Page 104)

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Require DGPS
You can force AirMap to require DGPS for reporting a valid position.
(The default setting, off, uses DGPS automatically, but doesn't require
it to yield a position.) Here's how to turn it on and off.
1. Press MENU | MENU |
↓ to
GPS S
ETUP
| ENT |
↓ to
R
EQUIRE
DGPS | ENT .
2. To return to the last page displayed, press EXIT | EXIT .
3. You can return to this command and press ENT again to turn the fea-
ture off.
Require DGPS command on the GPS Setup Menu.
Screen Contrast and Brightness
To access these screen commands, you first press MENU | MENU | ENT .
Once in the Screen menu:
To adjust the display's contrast:
1. The
C
ONTRAST
slider bar is already selected. Press
→ or ← to move the
bar. The left end of the scale is minimum contrast; the right end is
maximum contrast. Adjust the screen so that you see white, black & 2
shades of gray at the top of the screen.
Screen Command, left, and Contrast bar, right.