Question about Garmin Gsd 21 Sounder Blackbox Fishfinder Module

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Sounder not working

When i put the sounder on the whole screen is filled with interference

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My gsd 21 does not work with my gps 2106

Posted on Jun 11, 2010

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Interference like that is usually caused by electrical noise. Does it happen when everything else on the boat is turned off? If the answer is no, then you can isolate the source of the interference by turning things on one at time. Follow your transducer cable and make sure it has not been damaged or altered in any way.

Also make sure that your gain is set to auto

The GSD 21 has an LED indicator light on it. If it detects a malfunction the LED will flash in distinct colors or patterns. In the troubleshooting section of the owners manual there is a list that explains what each flash pattern means.

Posted on Jul 26, 2008

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1 Answer

Why can't I get picture or sound when my Sound Bar, TV and Blu-ray player are connected?


You have to run an audio cable from the TV to the sounder and put the sounder on the TV input for sound to work. The first choice audio cable for best sound would be optical cable if your tv has optical output on it. If it does then you would put the sounder on the din input for sound when watching antenna or any hdmi source connected directly to tv. If your TV only as analog rca out or mini audio out then put sounder on aux input. I think your sounder came with mini to mini stereo cable. If your TV doesn't have mini audio out the get a optical cable or you can find a mini to rca red/white will work. Optical is your BEST connection and soundbar would stay on din all the time for best sound.

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Parking sensors


you can check the sensors by putting in reverse with ign on no engine running. and listen to each sensor in turn put your ear close to sensor it should click very faintly any that don't are poss faulty does the sounder emit a error tone one long beep if not check for water in the module located in boot against rear panel.if that's ok the sounder may have gone down

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1 Answer

Back up sensors


put it in r with ign on put your ear on each sensor close to each sensor in turn they should make a faint clicking sound any that dont could be faulty, does the sounder give a error tone? if not the sounder may be faulty.

Oct 14, 2013 | Jaguar XJ8 Cars & Trucks

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I have a furuno fcv 582l. The unit has just come back from the factory and works well until I power up any other electronic equipment on the boat. Then it flickers and the screen goes dark. Any ideas?


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May 15, 2010 | Furuno FCV-582L GPS Receiver

1 Answer

Furuno sounder trandecer problems


the leading edge of the ducer should be higher than the aft portion. The leading edge must not be below the bottom of the transom. To determine if it is turbulence or radiated interference, put the boat in neutral and run motor up in RPM, if it fails then, with boat stationary, then proximity to motor is a problem and you should buy and in-hull ducer. glueing the transom ducer may or may not work well.

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3 Answers

Garmin 168 Sounder LCD screen display errors


I had the same problem and contacted Garmin. This is being caused by a software issue that started when the government updated the software in their WAAS satellites. The Garmin website will give you instructions on how to correct this but I have listed them below:

Power on unit
Press enter to get past the I Agree screen
Now you should be on the satellite page, press the menu button one time
Highlight WAAS off and press enter
By doing this, the unit should not shut down.

I followed these instructions and my 168 Sounder is working fine.

Jul 31, 2008 | Garmin GPSMAP 168 Sounder GPS Receiver

2 Answers

GPSMAP 235 Sounder


Some 235s had a problem with the contrast setting. When the contrast is set to full the screen turns black.

When you turn on the GPS and the screen goes black, try tapping the left arrow on the track pad a few times. You should see the screen start to lighten. If that doesn't work, tap the power key and try tapping the left arrow a few times.

May 17, 2008 | Garmin GPSMAP 235 Sounder GPS Receiver

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