Garmin 4008 Manuale Proprietario

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Keel Offset—offset the surface reading for the depth of a keel. This makes it possible to measure 

depth from the bottom of your keel instead of from the transducer’s location. Enter a positive 

number to offset for a keel. You can enter a negative number to compensate for a large vessel that 

may draw several feet of water.

1.  From the Home screen, select

>

>

.

2.  Use the select screen keyboard 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 the transducer type, set the temperature source, sonar cone angles, and calibrate 

water speed.

Type—set the transducer type (Dual Frequency or Dual Beam).
Temperature Source—set the temperature source (

 or 

).

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. This option should only be used 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.

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