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Two problems with Humminbird 788cxi combo marine GPS/sounder- even though I take the auto depth sensor off and set the sonar depth manually, the sounder loses contact with the bottom and reads .7mtrs when I know I am in waters of 12 mtrs, or 35mtrs, it does not make a difference what depth of water I am in. The transducer is a professionally mounted through hull which was bought and installed with new boat by the dealer. When turning sounder on, it prompts to install latest version firmware upgrade from sd card, but I have already granted permission and followed prompts several times already. Each new boot up it prompts again. Should I wipe all info on SD card after backing up to PC and start again? Thanks in advance Brian

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: A65 Transducer

jmiller,

Sound like your getting turbulence from the hull or your angle is allowing cavitation under the transducer. Look under the hull where the traducer is mounted and look for a part that has no obstruction including saltwater pickups, hull relieves, etc. The other thing to check is to take a strait edge on the bottom of the transducer to ensure the angle is slightly forward than the hull.

Bob

Posted on Dec 27, 2008

  • 5 Answers

SOURCE: I have a GPS Map 498-depth sounder not working? Ha...

If the transducer is out of the water, you will not get a reading and see the flashing depth. You should hear and feel the clicking in the transducer when out of the water and working properly. Are you getting a temp reading when out of the water?

Posted on Jul 31, 2010

  • 29 Answers

SOURCE: Hi. Just wondering how should

You can take a picture of the transom of your boat and email it to Humminbird and they will email it back to you where the transducer should be mounted at. Our email address is service@humminbird.com.

Joby @ Humminbird

Posted on Dec 27, 2010

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