Garmin Gsd 21 Sounder Blackbox Fishfinder Module Logo

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Posted on Nov 16, 2017
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I have a garman 478 and installed a gsd 21 and transducer. The gsd 21 and 478 powers up but the gsd 21 flashes 1 sec on 1/2 sec off signaling a wireing problem, the gsd 21 does not have instructions for a 478 so I used the wireing diag for the single 396 . Is there a different wireing for a 478 or am I doing something else wrong

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robert conway

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  • Posted on Nov 21, 2017
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Kevin Gens

  • 64 Answers
  • Posted on Jun 14, 2010

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: [email protected] if you want to discuss your uses further and if you want to purchase a transducer.

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Apr 21, 2014 • Garmin Gsd 21 Sounder Blackbox Fishfinder...
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The first image below shows the method for accessing the pressure transducer tube that runs from the bottom of the washer tub to the machine control. I recommend checking this air hose for pinches, twists or crimps.NOTE: Be sure to unplug the washer to disconnect electrical power before accessing internal components.

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Image 1


Image 2

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Jan 09, 2011 • Kenmore Washing Machines
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Could you please let me know witch transducer to use with gsd 21
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
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It all depends on the type of boat and how you are going to be using the fishfinder. Here is my email: [email protected] if you want to discuss your uses further and if you want to purchase a transducer.






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

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Gsd 21 Sounder Blackbox Fishfinder Module

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