I own a 1972 Santana 37 (cored hull) and am attempting to upgrade the chartplotter
/ sonar with a new Garmin
The old owner (of 32 years), rather than drilling a hole in the hull
(which I agree with), fabricated a waterproof box, which he filled with some kind of green fluid (still there) and placed the through-hull transducer
in the box and sealed it up.
I assume it worked, but by the time I bought the boat
, the display unit was bad and I removed it during my early fix her up phase.
Now I am wondering if I can do the same with a new Garmin
as I really don't want to put another hole in the boat
I've attached a picture of the transducer for reference.
I would love to hear from anyone that has seen this setup or installed something like it on their own boat.