Lowrance electronic 540c Baja - Manual (Page 95)

87
To turn on/off Lat/Long Grid lines:
1. From the Map Page, press
MENU
| ↓ to
M
AP
D
ATA
|
ENT
.
2. 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.)
3. 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 an area covered by the map
or chart. These surveys are called Datums. Maps using different da-
tums will show the same latitude/longitude in 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 unit uses the
WGS-84 datum. It, however, can show your position using any of 191
datums. Different datums can be selected. To change the datum:
1. Press
MENU
|
MENU
| ↓ to
GPS S
ETUP
|
ENT
| ↓ to
D
ATUM
S
ELECTION
|
ENT
.
2. Use ↓ ↑ 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.
The Map Datum Menu.
Map Detail Category Selection
This menu determines which of the mapping features are shown on the
screen. This includes: waypoints, trails, icons, cities, highways, etc. You
can turn on or off any of these items to customize the map.