Garmin gpsmap 4008 User Manual

Configuring the Chartplotter

3.  Select an alarm.
4.  Select 

 to turn the alarm on, and then specify alarm information.

To set a navigation alarm, from the Home screen, select 

 > 

 > 

.

Anchor Drag—set an alarm to sound when you exceed a specified drift distance.
Arrival—set an alarm to sound when you are within a specified distance or time from a destination 

waypoint.
Off Course—set an alarm to sound when you are off course by a specified distance. 

To set a system alarm, from the Home screen, select Configure > Alarms > 

.

Clock—set an alarm using the system (GPS) clock. The unit must be on for the clock alarm to work.
Battery—set an alarm to sound when the battery reaches a user-determined low voltage.
GPS Accuracy—set an alarm to sound when the GPS location accuracy falls outside the user-

determined value.

To set a sonar alarm, from the Home screen, select Configure > Alarms > 

.

  NOtE: You must have an optional sonar module (and a transducer connected to the sounder module) 

wired through NMEA 0183 or connected to the Garmin Marine Network 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 reports a temperature that is 2°F (1.1°C) 

above or below the specified temperature.
Fish—set an alarm to sound when the unit detects a suspended target of the specified symbols.

— sounds an alarm for all fish sizes

— sounds an alarm for medium and large fish only

— sounds an alarm for large fish only

To configure settings for your boat, from the Home screen, select 

 > My Boat.

Auto Guidance—set the Auto Guidance parameters for your boat:

Safe Depth—set the minimum depth (chart depth datum) to allow when calculating an auto 

guidance path. A safe depth of less than one meter is not allowed when using Auto Guidance.
Safe Height—set the minimum height (chart height datum) of a bridge that your boat can safely 

travel under.

Keel Offset—offset the surface reading for the depth of a keel, making it possible to measure depth 

from the bottom of the keel instead of from the transducer location. Enter a positive number to offset 

for a keel. Enter a negative number to offset for a large vessel that may draw several feet of water.

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