[Richard James]

Hello Doug,
When I was looking at the same idea in 2014, I received conflicting advice. I didn’t want to drill a hole in the hull, so I fitted a transducer carefully on the transom, as close to the centreline as possible. Occasionally, if really heeled over, it will go into memory, but if I ease off for a couple of seconds, I get a depth reading quickly. I connected it to an old Garmin Fishfinder display and it works well.

https://seamarknunn.com/acatalog/Garmin-Transom-Mount-Transducer-with-Depth—Temperature–4-pin–Dual-Beam—-Garmin-Design-SM230_0101024920.html?gclid=EAIaIQobChMIxvnP1dyE8AIVE7rtCh2dIwbCEAQYASABEgINJvD_BwE