Question about Garmin Gsd 21 Sounder Blackbox Fishfinder Module

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GPSMAP 478 and GSD 21 connection issue

I have had these units conneted for about 3 years with no issues. Now the transducer is not communicating with the GPS478 unit. it is indicating that there is a wiring issue. after substantial checking and rechecking of the wiring and fuses, I am lost........ can anyone help?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: could you please let me know witch transducer to

Here are your options:

In-hull Mount Transducer (200/50 kHz, 12/45 deg)
010-10327-00

Thru-hull Mount Transducer with Depth and Temperature
010-10194-01

Bronze, Thru-hull Mount Transducer with Depth and Temperature
010-10182-01

Transom Mount with Depth, Temperature and Speed
010-10192-01

Transom Mount with Depth and Temperature (200/50 kHz, 10/40 deg)
010-10272-00

Thru-hull Mount Transducer with Depth (200 kHz, 12 deg)
010-10107-00

It all depends on the type of boat and how you are going to be using the fishfinder. Here is my email: kevin@sun-me.net if you want to discuss your uses further and if you want to purchase a transducer.






Posted on Jun 14, 2010

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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.


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Sounds very much like the wiring plug connections in the back, always overlooked but so important that connections are tight and contacting.

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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.

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Transducer


I have the exact same problem. Were you able to solve your problem???

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