Question about Garmin Gsd 21 Sounder Blackbox Fishfinder Module

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Gsd 21 sounder not working properly

Works fine above 20 feet, below 20 feet I loose bottom and the depth goes wacky reads 1.5 feet . I get a blank screen or a static screen. I have it hooked up with a garmin 3010 chartplotter

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  • chip2594 Jan 27, 2009

    Having same problem with finder working in shallow water randomly. Will not work in depths over 15 to 20 feet. Was told by tech support that module needed to be replaced. Replaced module and same problem is occuring. When system first is turned on it has a hard time acquiring GSD signal.

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SOURCE: unable to track the bottom

I think you need to level the transducer. You have it pointed way out in front of you so that when you're going fast it is able to bounce the signal off the bottom and it comes back to where the boat has traveled to. When you're going slow you're bouncing it out in front of you but it comes back up in front of you. Sorry but I can't find a picture of a Garmin transducer. Hope this helps.

Posted on Jun 02, 2009

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I have a gps Map 498-depth sounder not working? Have new transducer from Garmin-it flashes "00"-it is not connected to boat yet (transducer)-need it be or can I put in a bucket of water (need it be in...


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1 Answer

Loses the depth after around 60 feet.


Is the transducer face clean? Fouling and barnacles can cause poor depth readings. Also, a low power output from transmitter or poor sensitivity of the receiver (both internal), or a broken transducer cable connection (usually accompanied by heavy noise being painted on screen). With your ear in the water, fairly close to transducer (6-10 ft., you should hear a clear tick-tick-tick sound as it transmits on a medium depth range.. No power adjustment is available in the menus, but the unit does transmit at a slower rate, with wider (stronger) pulses on the deeper ranges.

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1 Answer

Unable to track the bottom


I think you need to level the transducer. You have it pointed way out in front of you so that when you're going fast it is able to bounce the signal off the bottom and it comes back to where the boat has traveled to. When you're going slow you're bouncing it out in front of you but it comes back up in front of you. Sorry but I can't find a picture of a Garmin transducer. Hope this helps.

Jun 02, 2009 | Garmin Gsd 21 Sounder Blackbox Fishfinder...

1 Answer

Lowrance x96 does not function after 20 feet depth


Your transducer needs to be adjusted so the return signal can be picked up. Some of these have to be super tuned to receive the signal. Also the transducer may be moving ever so slightly when the boat is traveling at speed. You may have some water turbulence interference all contibute to signal return.

May 26, 2009 | Lowrance X96 200khz Fishfinder

2 Answers

Sounder not working


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.

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1 Answer

Faria Depth finder


I've found this manuals in Faria's site:

Depth sounder:
http://faria-instruments.com/site_manuals/IS0091F.pdf

Bombardier Depth Sounder:
http://faria-instruments.com/site_manuals/IS0138_C_digital_depth_sounder_owners_manual.pdf

Depth Sounder, Flushmount:
http://faria-instruments.com/site_manuals/IS0141c.pdf

Depth Sounder, Flush Mounted, Remotely Switched:
http://faria-instruments.com/site_manuals/IS0229_A_Digital_depth_sounder.pdf

there are also other useful manuals in the bottom of the page:
http://www.faria-instruments.com/downloads.php

Jul 14, 2008 | Faria Marine Electronics

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