Question about Garmin Gsd 21 Sounder Blackbox Fishfinder Module

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Unable to track the bottom

I have a 3210 garmin chartplotter with a gsd 22 sounder module, reads depth fine when moving but depth window flashes on and off when in 30 or so feet of water, whats wrong

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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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Posted on Jan 02, 2017

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My GSD 21 is mated to a Garmin 3210. Bought both componants new. Every single year since new it works 2-3 trips. Then just doesn't come on. Have to send it back to garmin who so far have waranted...


The GSD 22 is discontinued. I would not buy any electronics that are discontinued, because there has to be a reason.

If I were in your shoes I would be looking a full change to either the brand leaders, Raymarine or Humminbird. I have had Humminbird since 2007 with a 798SI and since 2014 with a 998SI HD. 100% reliable for GPS and depth. Boat used twice a week May to October. The 998 has features to set a chart course and I do that when coming from Toronto to Port Credit. Humminbird also do full chart plotters, but in Georgian Bay, I wouldn't have thought necessary unless you use an auto-pilot. Uses Blue Chart maps.

You aren't the only one to have problems. Read the link below.

I did find this thought and there are others in the thread
http://www.thehulltruth.com/marine-electronics-forum/146766-installer-i-stumped-garmin-problem.html

Make certain that the transducer(s) cable is separated from any engine power cables. When those wires cross or are bundled together, the highly sensitive sonar signal gets polluted with high amp noise bleeding off the engine wires, and you're lucky to get any signal.
To test if this is the problem, shut your engines off and see if you get a good sonar view. Then start the engines and see if the same sonar quality is displayed. If it degrades, you've got the current bleeding problem.
I had this problem when I installed the new gear (Furuno 585, Airmar b60) and ended up re-routing the transducer cable using some "wire hangers" to keep the transducer cable away from the others. Now I get a firm fix on the bottom at all speeds and the only time the display gets lost is when I reverse the starboard engine, from air bubbles under the thru-hull.


GSD 21 with 3210 problems - Google Search

Mar 21, 2017 | Garmin Gsd 21 Sounder Blackbox Fishfinder...

1 Answer

My Garmin 498C will not show the contore of the bottom or give me a depth reading. The GPS works and will show me charts but, not the sounder option though.


You need to check to see if the depth sounder transducer is connected or functioning. It might be turned off, the connectors may be bad or the transducer is bad. I don't have the 498 manual in front of me but I think there is a test function under the setup menu. I'd check my connections (the usual suspect) then run that.

Garmin tech support is pretty good/quick. So don;t be afraid to give them a call.

Aug 29, 2010 | Garmin GPSMAP 498C Sounder GPS Receiver

1 Answer

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...


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?

May 16, 2010 | Boating

1 Answer

Garmin gps 498.


I think the transducer is down too low. Raise it up so that the center of it is in line with the bottom of the boat.

Jun 02, 2009 | Garmin GPSMAP 498 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.

Jul 24, 2008 | Garmin Gsd 21 Sounder Blackbox Fishfinder...

1 Answer

GSD 20 power problem


I'm not sure what you mean by "cannot get the sounder to power up". Are you not getting power to theGSD20, or are you not getting the sounder to display on the screen? I can probably help you with this but I need some more information.

If you are getting power to the GSD 20 sounder, it will have a flashing LED next to the cables that plug into the GSD 20 box. What color is it and what is the flash pattern (how many flashes, and fast or slow?) When you power up the GSD20 does the color or flash pattern change.

I'll watch for your response here.

Feb 23, 2008 | Garmin GPSMAP 3010C GPS Receiver

1 Answer

Log and trip function not registering


It is unlikely the problem is in the A65 screen.....most likely it is an issue with the paddlewheel itself, its circuit in the depth/speed transducer, or least likely, in the DSM25 sounder module.

Both the log and the trip functiions are read from the paddle-wheel sensor of the connected DSM25 sounder module and transducer.

1. Make sure you have a DSM25 sounder module and transducer with a paddle wheel (the A65 is available without the DSM25 option.)

Double check the connections between the DSM25 and the A65, as well as the transducer connection to the A65. There is an indicator light on the DSM25 to confirm it is on.

2. Make sure the paddle wheel turns freely. They tend to get fouled easily with debris and growth.

3. Make sure the A65 is giving to a reading for SPEED when underway or when having a buddy spin the paddlewheel by hand. Do not confuse SPEED with SOG. SPEED is from the paddlewheel.....SOG (Speed over ground) comes from your GPS sensor and is not used by A65 for log or trip purposes.

If you get npo speed reading at all the paddle wheel may be defective or the depth/speed transducer may be defective. See your dealer about a replacement.

Nov 06, 2007 | Raymarine A65 Combo GPS...

1 Answer

NO DEPTH READING


Check the finder on the bottom of the boat and make sure the cable is ok?

Aug 09, 2007 | Garmin 185 Sounder GPS Receiver

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