Ok were would you mount a transducer for Depth?
I really dont want to transom mount one?

You need the thru hull transducer and I epoxied mine in the far aft bottom corner of the stbd sponson.

Does is seem to work good / accurate there?? I have been pondering the same question lately.

Probly not as acurate as a transom mounted one since it does have to shoot thru the hull but you have to make sure you get the proper one. Mine is angled slightly to fit the angle of the hull bottom and it came with the epoxy. The angle allows it to shoot straight down. Only acurate at slower speeds is my guess, gets a little wonky over 60-70, LOL.

Another thing you have to worry about with "shoot thru the hull" transducers is the actual / final mounting location. They do not like any air bubbles either in the epoxy or the hull layup.

An old trick I use to find a suitable location is to have the boat in the water at a known depth. (And remember, that known depth is from the place the transducer is - usually below surface level - to the bottom. Place the transducer in a plastic shopping bag with the lead coming out the top and fill it with water so that the whole transducer is covered. Next, place the bag / transducer against the bottom where you'd like to mount it. If you get a good reading, great! If you don't, move it around until you find a location that works. Mark the location.

When you go to epoxy the puck in, be very careful when mixing the resin and hardener not to entrain air bubbles in the mix. Then, be very carful not to entrain bubbles when you apply the epoxy to the puck and / or the bottom.

Garmin has a transducer with a mount that compensates for hull angle. The biggest problem is if the hull has a core like balsa. I'm putting a new sensor in my V hull and contacted Velocity to find out what to look out for. They said to cut the inner fiberglass layer and use a chisel to remove the core. They make a slow setting epoxy to eliminate the bubble issue also. The Garmin's mount is glued to the hull with something like 3M's 3500 and then you fill it with anti-freeze and insert the transducer and screw it down.

That's the way you're actually supposed to do it with cored hulls. It takes brass balls to remove the core though. And if you really pound your hull, I wouldn't recommend it at all.