Garmin 90 Manuale Utente

Installing Your Fishfinder

Perform this test after you install the Fishfinder. Because 

you need water to carry the sonar signal, the Fishfinder 

does not function properly with the transducer out of the 

water. When you place your boat in the water, CHECK FOR 

LEAKS around the screw holes that are below the water 

line. DO NOT leave your boat in the water for an extended 

period of time without checking for leaks. 

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

sonar appears to be working properly gradually increase 

the boat’s speed 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, it might be necessary to 

move the transducer to a different location. 

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12/2/2011   3:08:58 PM