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Garmin GSD 21 - GPS Receiver Remote Sonar Sensor Support Questions

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Garmin Gsd 21 Red Light Spot: 'check Wiring'
I did seriel Wiring GSD 21 with transom outside transducer to GPSMAP 276C as shown by Garmin but did...

Garmin Gsd 21 Wiring Diagram With 17x
trying to wire Garmin 3206 with GSD 21 and 17x antenna? Might you have a diagram?

Problem With My Gsd21 Model
I have install a gsd21 in my boat on a 2010 display and it was working good for two days and sudentl...

We're Can I Find One To Buy
There are several for sale on eBay.

We're Can I Find One To Buy
looking for working gsd 21 sounder module for sale

(Posted by Fishbuster 9 years ago)

Gsd21 Replacement
What replaces gsd21

(Posted by Coastaldeck 11 years ago)

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