6
GPSMAP 640 Owner’s Manual
Marine Mode: Advanced Configuration
Configuring Alarm Settings
You can configure the GPSMAP 640 to alert you when certain
events occur.
Setting Navigation Alarms
From the Home screen, touch
Configure
>
alarms
>
Navigation
.
arrival
—sets an alarm to sound when you arrive at a
predetermined point.
type
—set the alarm to sound either at the
Destination only
or at the
Destination and turns
(when navigating a route with
turns).
activation
—set the criteria for the alarm. The
Distance
setting
sounds the alarm when you are a specified distance from the
point. The
time
setting sounds the alarm when you are a
specified time from the point.
Change Distance/Change time
—specify the distance or time
from the point at which the alarm will sound.
anchor Drag
—set an alarm to sound when you drift a specified
distance from your current location.
off Course
—set an alarm to sound when you steer a specified
distance from your current course.
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Setting System Alarms
From the Home screen, touch
Configure
>
alarms
>
System
.
Clock
—set an alarm using the system (GPS) clock. The unit must
be on for the clock alarm to work.
GPS accuracy
—set an alarm to sound when the GPS location
accuracy falls outside the specified value.
Setting Sonar Alarms
From the Home screen, touch
Configure
>
alarms
>
Sonar
.
Note:
You must connect an optional sonar module and a
transducer using NMEA 0183 to receive sonar information.
Shallow Water/Deep Water
—set an alarm to sound when the
depth is less than or greater than the specified value.
Water temp
—set an alarm to sound when the transducer or
temperature sensor
reports a temperature that is 2°F (1.1°C) above
or below the specified temperature.
Setting Weather Alarms
Note:
You must have a subscription to XM WX
™
Weather and a
GXM 40 antenna connected to view weather information. See
for more information.
From the Home screen, touch
Configure
>
alarms
>
Weather
.
