Garmin gpsmap 4008 User Manual

Configuring the Chartplotter

1.  From the Home screen, select 

 > 

 > 

.

2.  Use the 

 (GPSMAP 4000 series) or the screen keyboard (GPSMAP 5000 series) to 

specify the offset.

3.  Select 

 to accept the number.

  NOtE: Select 

 to cancel your changes and return to the My Boat screen.

Transducer—select sonar-cone angles, and calibrate water speed.

Sonar Cone Angles—when using a transducer other than the standard Garmin transducer, you 

can set the angle, in degrees, of the sonar cone so that it is accurately depicted on the Fish Eye 3D 

screen. Select either 

 or 

 and use the on-screen keyboard to enter the angle.

  NOtE: The Sonar Cone Angles setting is preset to match the cone angle of a standard Garmin dual-

frequency transducer. Use this option to match the specifications of a non-standard transducer.

Calibrate Water Speed—use this menu to calibrate a speed-sensing device. Follow the on-

screen directions for calibration. If you do not have a speed-sensing device, this menu does not 

appear.

  NOtE: If the boat is not moving fast enough or the speed sensor is not registering a speed, a “Speed 

Too Low” message appears. Select 

 and safely increase boat speed. If you get the message again, 

stop the boat and make sure the speed-sensor wheel is not stuck. If the wheel turns freely, check the 

cable connections. If you continue to get the message, contact Garmin Product Support.

To configure settings for boats other than your own, from the Home screen, select 

 > 

.

AIS—turn AIS (Automatic Identification System) on or off. AIS alerts you to area traffic by 

providing boat IDs, position, course, and speed for boats that are within range and equipped with a 

transponder.
DSC—turn DSC (Digital Selective Calling) on or off.

  NOtE: To configure AIS or DSC information for other boats, your unit must be connected to an 

external AIS or DSC device. 

Safe Zone—(AIS and MARPA only) turn a safe zone around your boat on or off. This is used for 

collision avoidance, and can be customized.

From the Home screen, select 

 > 

 > 

>

.

Ring—show or hide a ring on the Navigation chart showing the safe zone for your boat.
Range—change the measured radius of the safe zone ring to a specified distance from 0.1 to 

2.0 nm (or from 0.2 to 5.0 km, or from 0.1 to 2.0 mi).
Time to (Safe Zone)—sounds an alarm if AIS or MARPA determines that a target will intersect 

the Safe Zone within the defined time interval (ranging from 3 to 24 minutes).

Details—show or hide the name, speed, and bearing of AIS or MARPA targets onscreen. The details 

appear next to the AIS or MARPA target icon.

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