Question about Garmin 340c Fish Finder Dual Frequency Saltwater

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My 340c fishfinder won't turn on. The screen gives an occasional fllash but won't come fully on.

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Posted on Jan 02, 2017

emissionwiz
  • 75051 Answers

SOURCE: My Garmin 340C fishfinder flashes

Hello
More than likely the Sonar transducer has failed. Since Garmin doesn't release repair information to the public you will need to send it back to Garmin for repair or exchange, since the model is no longer sold they will most likely offer you a discount on a newer model of the 340C.. Here is a link to the out of warranty web page of Garmin.

http://www8.garmin.com/support/outofwarranty.html

Posted on May 25, 2011

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How do i find water depth


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Hello. Your observation is spot on and it is actually a characteristic that is always true when using sonar. Yes, your Lowrance uses the same sonar as a nuclear powered submarine does. The two factors you focus on, water depth and boat speed are perhaps, the two biggest factors when it comes to the quality of the fishfinder. The boat's engine should be in gear at an idle or just above. Experiment with your boat to find the best throttle location for good arches. Usually, a slow trolling speed works best. The depth of the fish can determine if the fish will arch on the screen. If the fish is in shallow water, the fish is not in the cone angle very long, making it difficult to show an arch. Typically, the deeper the fish, the easier it is to show an arch.
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1 Answer

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1 Answer

Garmin, 340c,440s, 420s


You can download them for free at these sites if it helps you.

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http://www8.garmin.com/support/userManual.jsp?market=2&subcategory=31&product=010-00505-00

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http://www8.garmin.com/support/userManual.jsp?market=2&subcategory=30&product=010-00516-22

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http://www8.garmin.com/support/userManual.jsp?market=2&subcategory=30&product=010-00516-42

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1 Answer

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