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installation was simple - plug it in and it works - a few things are weird - the unit comes with no owners manual - just a stapled install sheet that shows a schematic that is wrong. Garmin tech admits this...they don't show you have to hook a power lead to it at all, it looks as if hooking it to the network will supply power - wrong - connect the power leads, transducer and the network cable and you're up and running.
The display has more color and seems more defined, just sitting at the dock. It has a feature called ultrascroll - which allows the display to move faster across the screen and the gain settings 'auto-adjust" in that they moveup and own before settling in.
More as I get out in the water later this week... we have 30 knot winds now...
The sonar instuctions look to be in the 3210 manual but that does not do us 3010 onwers a lot of good if you are upgrading.......download the PDF from Garmin...
Thanks for the update. Mine is still on order. You got yours quickly, and installed to boot. Be interested to read how it works running in deep water, and how it marks fish.
I guess the unit turns on and off like an amp, i.e., has its own power leads, but is activated by the network connection?
Thanks for the update. Mine is still on order. You got yours quickly, and installed to boot. Be interested to read how it works running in deep water, and how it marks fish.
I guess the unit turns on and off like an amp, i.e., has its own power leads, but is activated by the network connection?
got mine from consumers marine - yes - network turns it on....
Glen could you explain the difference in the 20 21 and 22's to me . I can't seem to get much off of garmin's site. I am interested in one but I have the 2010c. Thanks
Glen:
I too have a 3010C connected to a GSD 20. The sonar has been pretty balky since installation two season (and two transducers, and two displays...) ago. I am going to change out the GSD 20, and will probably buy the 22 as a stop-gap for this season.
Before I do - just how much of a plug and play was the switch? I notice the GSD 22 has 3 ports (power/netweork/transducer) vs. only 2 on the GSD 20 (power/data - transducer).
The 21 looks to have the identical setup to the 20, where i could simply pull the old unit and plug in the new one. Any thoughts based upon your install experience would be appreciated. Thanks, Paul
Recently did the GSD 20 to GSD 21 "Upgrade". I have a 3010c.
I started with the GSD 20 I bought used, and it worked great for while, then gradually started not reading bottom, until it got to where it did that all of the time. I thought it was the transducer. So I replaced that, and it still didn't work. So after getting an RMA on my GSD 20 from Garmin, i wanted to go out last weekend, but needed sonar. I stopped by West Marine and picked up a GSD 21 with an internet matched price ($212). I plugged it in using the same wiring and it worked fine. It still lost bottom a few times when running behind boats in their "prop wash", but over all it worked better. Garmin tech says aside from the CANet that the GSD21 supports that feature Ultrascroll, they are the same as the GSD 20 in serial mode.
My neighbor has the GSD 22 on his 3210, and oddly, has intermittant sonar like i did with my GSD20. He swapped out tranducers, but not the GSD22 yet.
Glen:
I too have a 3010C connected to a GSD 20. The sonar has been pretty balky since installation two season (and two transducers, and two displays...) ago. I am going to change out the GSD 20, and will probably buy the 22 as a stop-gap for this season.
Before I do - just how much of a plug and play was the switch? I notice the GSD 22 has 3 ports (power/netweork/transducer) vs. only 2 on the GSD 20 (power/data - transducer).
The 21 looks to have the identical setup to the 20, where i could simply pull the old unit and plug in the new one. Any thoughts based upon your install experience would be appreciated. Thanks, Paul
assumiong you are not using the network input on the 3010 - it's a simple as running power to the 22, network cord from 3010 to 22, and transducer plug in...
Thanks Glen. Joe - your experience sounds eerily familiar...
Was your GSD 20 doing the same thing?
My unit loses bottom intermittently (but regularly), and always has. I have tried multiple transducers. The most frustrating part is that there is no rime or reason to it - sometimes it reads fine, other times it loses fix. I can be stationary at the dock - one minute a steady reading of 8 feet, moments later, the dreaded blinking lines.
Same problem with my GSD 20 on 3010c network. Intermittant! Have thruhull 1 KW transsdcuer so changing/fairing block is not something I want to do in a hurry. Have swapped GSD 20 for GSD 22 in the hpope that digital will work better for me. So far can not tell as unit appears DOA. Will keep forum posted. Garmin has been great with support in the past.
1st impression : garmin GSD22 install 
