Fish Finder losing signal at speed, can't rectify issue

Flyin' Hawaiian

Recruit
Joined
Jul 19, 2020
Messages
4
Hey all,
Newbie here, thought I'd see if anyone has some alternative tips/tricks to get the fishfinder to stop flashing depth at speeds above 20mph! This is on a brand new Garmin Striker Plus 5cv with that HUGE GT-20 transducer it comes with.

This has happened on two different boats now (just bought a new boat, pulled this from the old boat and installed on new boat). I've moved the transducer around quite a bit on the old boat, and now doing the same thing on the new boat. I've followed several instructions on installing the transducer a quarter inch down from the horizontal plane on the 'ducer below the hull, made sure its not in the wake of any of the rails under the boat, moved sensor up and down a half inch (trying each time to see if it works better or worse) and I'm just coming up with no remedy.

Just an fyi, the new boat is an aluminum hull and a 150 jet outboard is the main power, so that should eliminate the issue of prop wash.

I really want to like this Garmin, but I am not happy about losing depth at speeds over 20mph. I run a fair amount of streams/lakes/reservoirs that are 5-10 feet deep in certain areas and sometimes even shallower than that.

Any info appreciated!
Chris
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
51,207
look at the hull in front of the transducer. is there any rivets or anything forward of the transducer that could cause bubbles in the water stream?
 

Flyin' Hawaiian

Recruit
Joined
Jul 19, 2020
Messages
4
No rivets or rails directly in front of the transducer, its extremely smooth all the way forward. There is a rail to the right of it, and I mounted the transducer over to the left to make sure it was not in its path. I go to look under the boat and what do I see? Another rail about 4 feet forward, almost directly in front of the transducer!

Moved the transducer over to the right so its in between the two rails. It seems to work, a 10 minute speed run in kinda rough water showed no flashing! It changed depth normally the whole time, not one flashing error out of the whole morning run.

I don't wanna speak too soon though, maybe it was just a fluke today! I'll update in a week on whether I'm still having issues with it. Thanks for the suggestion!
 
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