Question about Garmin Gsd 21 Sounder Blackbox Fishfinder Module
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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Posted on Jan 02, 2017
Here are your options:
In-hull Mount Transducer (200/50 kHz, 12/45 deg)
Thru-hull Mount Transducer with Depth and Temperature
Bronze, Thru-hull Mount Transducer with Depth and Temperature
Transom Mount with Depth, Temperature and Speed
Transom Mount with Depth and Temperature (200/50 kHz, 10/40 deg)
Thru-hull Mount Transducer with Depth (200 kHz, 12 deg)
It all depends on the type of boat and how you are going to be using the fishfinder. Here is my email: email@example.com if you want to discuss your uses further and if you want to purchase a transducer.
Posted on Jun 14, 2010
Testimonial: "thank very much for info it was spoton"
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