User Manual

GPSMAP 78 Series Owner’s Manual 25
Customizing Your Device
reects the drawing scheme of
paper charts.
◦ —(requires marine maps)
displays a detailed view of bottom
contours and depth soundings.
Simplies map presentation for
optimal use while shing.
• —allows you to turn
spot soundings on and set dangerous
depths.
• —displays the sector
in which a navigational light is visible.
You can select to show light
sectors at all times, or you can select
 to allow the chartplotter to
automatically lter out light sectors
depending on the zoom level.
• —allows you to show
NOAA or IALA symbols on the map.
• —sets the
anchor drag alarm, off course alarm,
deep water alarm, and shallow water
alarm.


You can set an alarm to sound when you
exceed a specied drift distance while
anchored.

From the main menu, select  >
.

Select > .

Enter a distance.

Select .

You can set an alarm to sound when you
are off course by a specied distance.

From the main menu, select  >
.

Select > .

Enter a distance.

Select .