Join Date: Nov 2013
Location: Southern Tier, NY
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Re: chartplotter/sonar system for catalina 22
Correct, they won't give you water speed or temperature, just depth (and fishfinding). In my case, I was happy with the GPS speed instead, and if I want to know if the water is cold, I'll stick my toe in lol. That, and the cost of the multi-function thru-hull was a little more than I wanted to put into something I was already putting money into. But it depends on each persons location, sailing habits, etc.
I do believe you're correct that it would be unit-dependent. I never looked into it, since i went the route I did. I'm sure Garmin can tell you, or even perhaps download the owners manual / installation for that unit from the web and see if it mentions setting the inputs based on what transducer, and so forth.
1970 Islander Excalibur 26 - Constant Resto
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2015 home: Fair Point Marina, Fair Haven, NY - Lake Ontario