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Author Topic:   Garmin Fishfinder 140 SONAR
gtuorto posted 06-09-2008 07:01 AM ET (US)   Profile for gtuorto   Send Email to gtuorto  
Just purchased a 150 Sport with a Garmin Fishfinder 140 SONAR installed on the console. Both were new. First trip out, the Garmin Fishfinder 140 SONAR worked great, telling me depths at all speeds - which is important because I am on a river that gets extremely low water levels. Second time out the depth reading kept blinking and only would register realistic depths at very low speeds. Did I have a setting messed up?
jimh posted 06-09-2008 08:08 AM ET (US)     Profile for jimh  Send Email to jimh     
Check a couple of simple things first:

--check the transducer to see if there is anything fouled on it like sea grass;

--check the transducer to see if its mounting angle has become disturbed. Most transducer mounts permit the device to kick up if it hits something. Sometimes there is not enough tension in the mount to hold the transducer in position against the flow of water.

--try shutting the power off and back on. This often re-starts the SONAR auto ranging procedure, and it may find the bottom again.

If none of these work, you may have to adjust the sensitivity of the SONAR. Or, the transducer might not be optimally mounted. Sometimes a very small change in the immersion of the transducer will produce a big improvement.

Because you boat is new and the electronics were part of the purchase, if you can't easily resolve this yourself your Boston Whaler dealer will be a good source for a remedy.

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