Re: Installed my Bimini top on my FM165
It all depends on the transducer and the prop I guess. The Humminbird mounting directions say not closer than 15 inches to the prop which is somtimes hard to do on a small boat depending on the steps it has on the bottom.
Here is a pic of my Lund where the plate comes already mounted from Lund and is about 15 inches from the mid line of the boat. I've never had issues other than the rooster tail when it was hanging too low. It also has a pop up bracket if you hit something and it's popped up a couple of times. So I need to move it a little higher cause I'm getting a little spray too.
Here is a pic of our other boat. You can see the old holes to the left of the ducer where the former owner had it mounted. He said the Garmin never worked right for him. This was why. When I used the old holes our new Humminbird would not read at higher speeds.
It works fine now that I moved it 13 inches from the midline.
You can check to make sure your transducer is not the issue by filling the bilge with water and having someone hold it on the boats bottom while you bring the boat up to speed.