Garmin gpsmap 400 Manuale Utente

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1.  Begin testing the installation at a slow speed. If the sonar

appears to be working properly, gradually increase the

boat’s speed while observing the sonar’s operation. If the

sonar signal suddenly is lost or the bottom return is severely

degraded, note the speed at which this occurs.

2.  Return the boat to the speed at which the signal was lost.

Make moderate turns in both directions, and see if the signal

improves.

3.  If the signal strength improves while turning, adjust the

transducer so that it extends another 1/8" below the transom

of the boat. It might take several adjustments to eliminate the

degradation.

4.  If the signal does not improve, you might have to move the

transducer to a different location.

  NOTE: When adjusting the depth of the transducer, make the 

adjustments in small increments. Placing the transducer too 

deep can adversely affect the boat’s performance and put the 

transducer at greater risk of striking underwater objects.