Lowrance electronic AirMap 1000 - Manual (Page 95)

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To set range rings: Press MENU |
↓ to
M
AP
D
ATA
| ENT . Press
↓ to
R
ANGE
R INGS
. With the option highlighted, press ENT to check it (turn on) and
uncheck it (turn off). After the option is set, press EXIT to return to the
page display.
To set Lat/Lon Grid: Press MENU |
↓ to
M
AP
D
ATA
| ENT . Press
↓ to
L AT /L ON G RID L INES
. With the option highlighted, press ENT to check it
(turn on) and uncheck it (turn off). After the option is set, press EXIT to
return to the page display.
Map Datum Selection
Maps and charts are based on a survey of the area that's covered by the
map or chart. These surveys are called "Datums." Maps that are cre-
ated using different datums will show the same latitude/longitude in
slightly different locations.
All datums are named. The GPS system is based on the WGS-84 da-
tum, which covers the entire world. Other datums may also cover the
entire world, or just a small portion of it. By default, your position
shows using the WGS-84 datum. However, it can show your position
using one of 191 different datums.
To change the datum:
1. Press
MENU | MENU |
↓ to
GPS S ETUP
| ENT |
↓ to
D ATUM S ELECTION
| ENT .
2. Scroll
↓ or ↑ to select the desired datum, then press
ENT .
3. To return to the last page displayed, press EXIT | EXIT .
A list of the datums used by this unit is in the back of this manual.
GPS Setup Menu, left, Map Datum Menu, right.