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Fill Water With White
From the Map Page, press
MENU|↓ to MAP DATA|ENT. Press ↓ to FILL
WATER WITH WHITE. With the option highlighted, press ENT to check it
(turn on) and uncheck it (turn off.) After the option is set, press
EXIT|EXIT to return to the page display.
Map Overlays (Range Rings; Lat/Long Grid)
The map screen can be customized with four range rings and/or grids
that divide the map into equal segments of latitude and longitude.
Range rings are handy for visually estimating distances on the map. The
ring diameters are based on the current zoom range. At a 100-mile zoom,
the screen will show two rings with your current position in the center.
The large ring touching the left and right sides of the screen is 100 miles
in diameter (same as the zoom range). The second smaller ring is 50
miles in diameter (always 1/2 the zoom range).
The distance from your current position to the smaller ring (the ring's
radius) is 25 miles (always 1/4 the zoom range). With the map cursor,
you can scroll over 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: From the Map Data menu, highlight
RANGE RINGS
and press ENT to turn them on (check) or turn them off (uncheck). After
the option is set, press
EXIT.
To set Lat/Long Grid: From the Map Data menu, highlight
LAT/LON
GRID LINES and press ENT to turn them on (check) or turn them off (un-
check). After the option is set, press
EXIT repeatedly to get back to the
main page display.
Map Datum Selection
Maps and charts are based on a survey of an area covered by a map or
chart. These surveys are called Datums. Maps created using different
datums will show the same latitude/longitude in slightly different loca-
tions.
All datums have a name. The GPS system is based on the WGS-84 da-
tum, which covers the entire world. Other datums may cover the entire
world or just a small portion of it. By default, your position is shown
with the WGS-84 datum. It, however, can show your position using any
of 191 different datums.
To change the Datum:
1. Press
MENU|MENU|↓ to GPS SETUP|ENT|↓ to DATUM SELECTION|ENT.
2. Select the desired datum and press
ENT.