Depth Finder On A Jetboat

[Tsnert]

I am wondering if anybody out there has any suggestions on transducer mounting. I am not gettting a constant reading at high speeds, the depth will jump from the correct depth to the hundreds then back again it also will zero itself out. This happens while going straight but more frequently when making even the slightest turn. I have the seam of the transducer just a little lower than the bottom of the boat on a flat bottom. This is what hummingbird said to do in the instructions. I have raised the mount as high as it will go, so to get it any higher I will need to drill new holes. I am curious if because of the way the boat rides on plane if it is possible to get high speed readings at all? If the mount is raised so the reciever is even with the bottom of the boat and that works I would have no problem drilling new holes but if its pointless then the less holes in my boat the better. As always I appreciate any help. Thanks.

[Al Agnew]

I kinda doubt that you'll ever be able to get high speed readings on a jetboat. Also not exactly sure why you'd need to...can't be for navigation purposes. I have a depth finder on mine, but only use it while actually fishing. So I simply mounted my transducer on the trolling motor.

[Bman]

Air bubbles interfere with the transducer mounted on the rear of the boat, with a jet john. I'm with Al, put it on your troller. Can't really use 'em while running anyhow. By the time the thing told ya you're too shallow... it's too late. Ya gotta read the river.

[Tsnert]

Air bubbles interfere with the transducer mounted on the rear of the boat, with a jet john. I'm with Al, put it on your troller. Can't really use 'em while running anyhow. By the time the thing told ya you're too shallow... it's too late. Ya gotta read the river.

Thanks guys, I by no means am using it for navigation. I was just curious if anyone had luck with them at speed.

I was pretty sure that it wouldnt work but had to ask any how. I get fine readings while trolling when I am fishing so I will just leave it alone.

[Walleye1]

Thanks guys, I by no means am using it for navigation. I was just curious if anyone had luck with them at speed.

I was pretty sure that it wouldnt work but had to ask any how. I get fine readings while trolling when I am fishing so I will just leave it alone.

I've got a Lowe 1848 jon w/30 HP Evinrude jet and have a Garmin 240 w/transom mounted transducer and can read depth at WOT. Granted, on my rig, speed is only 22 MPH, at WOT and yours may be much faster but the bottom of my boat is pretty beat up and I still get a reading. Is it possible you've got the jet mounted a bit too low and that's where the turbulence is coming from? The leading edge of my pump is about 1/4" below the hull. I did install a transom mounting board before mounting the transducer so I could move it if necessary but guess I got lucky the first time.

walleye1

[Seth]

I am able to read at WOT on my 1648 with 50/35 jet outboard. My transducer is mounted a little bit below the recommended line. That's the only way I was able to get a reading while running with my jet. This also makes it more apt to break off by striking something....which I eventually did.

My buddy has an 1852 with a 90/65 etec and I never could get his boat to read while WOT. His boat moves faster than mine so maybe that's part of the problem.

[Tsnert]

I am able to read at WOT on my 1648 with 50/35 jet outboard. My transducer is mounted a little bit below the recommended line. That's the only way I was able to get a reading while running with my jet. This also makes it more apt to break off by striking something....which I eventually did.

My buddy has an 1852 with a 90/65 etec and I never could get his boat to read while WOT. His boat moves faster than mine so maybe that's part of the problem.

Walleye, my pump is mounted fine, but I did check and that was a good tip. I should have used a plate as well, maybe if I move it I will.

Seth I guess I could lower it but didnt want to rip it off all the time. How many have you gone through? I have a 1752 with 60/40 4 stroke merc. and it pushes the boat at 34 on gps so maybe its running to fast. oh well i will play with it when I get more time. Thanks.