My inboard jet boat transom mounted P66 transducer is supposedly mounted at the point it needs to be to read corrctly, per the shop that hooked it up for me, but it never stays on its mount and bounces around hanging by the cable. It broke off last fall so now I need a new one. I hate to drill a hole in my boat for a through hull installation and I'm wondering if I move the mount up an inch or so whether or not the transom mount will still get kicked off due to the speed I travel etc. or maybe then not read correctly. My trim tabs are so large it ends up the only place to mount it is next to the exhaust near the center of the boat, and lowest point, or I'd try moving it to the side a little. I'm mostly concerned about depth as I run down a river and setting up a depth alarm. I'll need to wait until next week to take any pics of the transom. I have seen on the web a picture of a little aluminum bracket added on the back of a boat where a through hull is mounted that looked cool, so that may be an option.
I also called Vixelar about their Alumaducer but they said it'll only read through .15 thickness aluminum, so that's out, and the standard in hull won't read through aluminum at all.
Any ideas? The GPS is a Garmin 740s.