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The distance from your current position to the smaller ring (the ring's
radius) is 25 miles. With the arrow keys and map cursor, you can scroll
the map to see the third and fourth rings. In this example, the distance
to the third ring is 75 miles and distance to the fourth ring is 100 miles
from your current position.
To set range rings: Press ↓ to
RANGE RINGS. With the option
highlighted, press
ENT to check it (turn on) or uncheck it (turn off).
After the option is set, press
EXIT|EXIT to return to the page display.
To set Lat/Long Grid: Press
↓ to LAT/LON GRID LINES. With the option
highlighted, press
ENT to check it (turn on) or uncheck it (turn off). After
the option is set, press
EXIT|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 "Datum."
Maps that are created using different data will show the same latitude/longitude
in slightly different locations.
All data are named. The GPS system is based on the WGS-84 datum,
which covers the entire world. Other data may also cover the entire world,
or just a small portion of it. By default, your unit uses the WGS-84 datum.
To change the datum:
1. Press
MENU|MENU|↓ to GPS SETUP|ENT|↓ to DATUM SELECTION|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 data used by this unit is in the back of this manual.
GPS Setup Menu (left); Map Datum Menu (right).
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