Lowrance electronic Mapping GPS & MP3 Player manual Map Datum Selection

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 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 MENU↓ to MAP DATAENT. Press ↓ to RANGE RINGS. 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 MAP DATAENT. Press ↓ to LAT/LON GRID. With the option highlighted, press ENT to check it (turn on) and uncheck it (turn off.) After the option is set, press EXIT to re- turn 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 MENUMENU↓ to GPS SETUPENT↓ to DATUM SELECTIONENT.

2.Scroll ↓ or ↑ to select the desired datum, then press ENT.

3.To return to the last page displayed, press EXITEXIT.

A list of the datums used by this unit is in the back of this manual.

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