Fill Water With White; Map Overlays (Range Rings; Lat/Long Grid); Map Datum Selection - Lowrance LMS-480 Operation Instructions Manual

Fill Water With White

From the Map Page, press
W W W
ATER ITH
(turn on) and uncheck it (turn off.) After the option is set, press
| to return to the page display.
EXIT EXIT

Map Overlays (Range Rings; Lat/Long Grid)

The map screen can be customized with four range rings and/or grids
that divide the plotter 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. For example: at the
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 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: From the Map Page, press
. Press ↓ to
|
D ENT
ATA
option highlighted, press
off.) After the option is set, press
To set Lat/Long Grid: From the Map Page, press
. Press ↓ to
|
D ENT
ATA
With the option highlighted, press
check it (turn off.) After the option is set, press
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. Different datums can be selected; to
change the datum:
. With the option highlighted, press
HITE
D
RAW
ENT
P
OPUP
|↓ to
MENU M
M B
AP OUNDARIES
to check it (turn on) and uncheck it (turn
|
EXIT EXIT
M I
AP NFORMATION
to check it (turn on) and un-
ENT
157
. Press ↓ to
|
D ENT
AP ATA
ENT
MENU
|→ to
R
ANGE
to return to the page display.
MENU
|→ to
L
AT
|
EXIT EXIT
F
ILL
to check it
|↓ to
M
AP
. With the
R
INGS
|↓ to
M
AP
/L G L
ON RID INES
to return to
.