echomap 73sv non-chirp
Spent some time with a 73SV today that is mounted on an aluminum boat with pontoons that stick out a little past the transom (mounting photo coming soon)
The unit gives great side view photos, but picks up a strong return at 2.5 feet down on the left side. The main issue is that when you slow down or drift with the wind, interference becomes worse and is repeated at consisted depth. I cannot figure out why running at a fast speed eliminates the issue
This is a shot after the boat is picking up speed and the interference starts to clear up
Image when drifting . The same interference is seen on the clearvu screen
So is sonar hitting the pontoon and bouncing back to the unit causing some kind of repeat effect? Why does this happen when boat is moving slow and not when it's moving fast, and why doesn't the same issue happen over the the right hand side with the other pontoon?