Have a 1991 Grady White 23' Gulfstream powere by 2000 Yamaha 250 - 2 stroke- wanted to upgrade the sounder - talked to South Shore and went with their advice on the Furuno 620 unit - they did the installation with a transom mount transducer - the problem is that I lose contact with the bottom (and everything between ) as soon as I ramp up the rpm's to get on plane - when I come off the throttle and move along at 2 mph the bottom returns as well as al the relevant marks
Assumed turbulance was the issue - South Shore has made every effort to correct the situation to no avail - last week I went so far as to have them install a thru hull transducer, but sadly the same results. So I have a significant investment here for a unit that does not work.
I am at a loss as to where to go from here - SS has talked to Furuno, with no suggestions from them as to what could be the problem
Would appreciate input from anyone on options - I cannot believe there is no set-up that will work with my boat - the unit that was on it when I purchased the boat was also a Furuno - it did not lose bottom, but was not able to detect fish at cruising speed - that is why I upgraded - the boat was purchased primarily for fishing.
I do not feel safe not knowing how much water is under me when undeway - even ran aground in Sandusky Bay last year when a sand bar had shifted over the winter - no damage or injury, but it is an issue.
Thanks for any advise or input