i would like to stay in the 300-500 range if possable. As far as the transducer goes....i have 2 issues 1 my boat is more a go fast style boat. It is a 241 four winns liberator. So when it comes up to running there is alot of the haul out of the water. the last one of these boats i had every time i got up on plane it would loss reading. I adjusted it to no end with no better result. I had just a regular humming bird first finder on it. When i would slow down i would get my reading back. My boat cruises about 32-35 mph at 3200rpm and does not stay on plane much below 20mph So it seems like once it comes up plane with 24 degree haul there is alot air bubbles and stuff going under the haul right where the trans. would be mounted.

My trailer is actualy a little larger for my boat. the front winch plate is welded to the trailer so no room to adjust it back and the bunks for the bottom are set up close together and there is 3 of them on each side and the extend out past the back of the boat by about 8 inches. They miss the outdrive and trim tab plates, but just barely on each. It has side bunk guides so it centers up everytime with no issues. With the bottom bunks the way they are a trans. mounted unit would break off each time i loaded it.

It has a built in depth finder that sends the signal through the the bottom of the boat that is glued in( not the drilled through hole ) and it seems to work good and not drop signal on plane. So i am assuming her that a trans would do about the same thing with the correct one. I know doing this i will loose some signal and all that....but i am weekend fisher and dont need the best of the best but dont want ot waste my money on things that wont do what i need.

I think a 4 or 5 inch screen would be plenty for me. I dont have much room to mount anything much bigger than this in the area that would be easy for me to see while driving without having to look down or way over to the side.