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GPSMAP 78 Series Owner’s Manual 29
Customizing Your Device
• —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.
Setting up Marine Alarms
Setting the Anchor Drag Alarm
You can set an alarm to sound when
you exceed a specied drift distance
while anchored.
1. From the main menu, select
> .
2. Select > .
3. Enter a distance.
4. Select .
Setting the Off Course Alarm
You can set an alarm to sound when
you are off course by a specied
distance.
1. From the main menu, select
> .
2. Select > .
3. Enter a distance.
4. Select .