I've been having some issues with our in-hull transducers and thus, depth sounder
I have just bought a new Humminbird HDR 650 and a dedicated shoot-thru-the-hull XP920 transducer to replace the old one. A simple unit I know, but it's really all I need. We have two. One on the flybridge and one at the lower helm
. Each has its own transducer and neither operate at the same time via a 3-way power switch. We also have a solid, non-cored hull
In the past, the old unit would, apparently, not be able to make an accurate reading and would only flash the last recorded depth
until it "recovered". After a few basic trial and error tests, I never had an "ah-ha" moment and figured that since it was cheap
enough, I'd just replace the flybridge unit, get a dedicated transducer, and task the unused one to the lower helm
After the install of the dedicated shoot-thru-the-hull transducer, the same problem occurred. Frustrating beyond belief. I even tried a couple of different spots with the same results. After a few streams of loud cussing ended, I decided to try the transducer that came with the unit. I mounted it with toilet wax in the same spot and it seemed to work. Not perfectly, mind you because it does still have some flashy moments in shallow water
, but it's better.
Now, here is the thing. I think it's happening becaue of the blister job we had done over the winter. I am wondering if there was a blister under the old transducer and when I mounted the new one, either there is maybe a bubble in the epoxy
barrier coat or the epoxy
itself restricts the beam. The bottom was covered with small blisters
and we sand blasted and coated the bottom (not the BEST solution, but it's what works for us).
Am I missing something? Is transom mounting an exercise in futility on a 35' trawler
? Seems to me that the more forward you mount it, the better. But then again, if you go into shallow water
at 7 knots, by the time your sounder goes off, you'll be unable to stop your boat in time to avoid hitting bottom. I have also heard that the prop spins out so much wash, there are too many bubbles in the water to get a reading.
(as you can see... I have a lot on my mind about this
m/v Skinny Dippin'