I sure wish someone would come out with a glue in transducer that can do all the 3D, ClearVu and all that cool stuff they can do nowadays...

I have the same, and I can get depth readings at 60 in flat water. Once I get in the air it takes a long time to reset, sometimes I have to turn off my GPS to get the depth readings back.

Interesting... mine doesn't do that.

With the Garmin unit GT15M-IH and an Echomap plus - do you still also keep the original transducer or the thru hull unit replaces it and is the only one? thanks!

What the thoughts on low profile through-hull units like the airmar B60 in a non-stepped hull?
Guess main question is, how much does the added drag actually cost ya..

Anybody have a good HDR 600 Humminbird laying around in white...
Need a good gauge.

I was wondering the same thing. I recently replaced/moved the transducer in my Donzi to an area that I assumed was solid glass, but still doesn't read worth s***. Was recommended by my local marina to put a through haul transducer, but still can't get past the idea of drilling a hole in my hull to plug with a piece of plastic...

I ended up going with that Airmar P series, but haven't got boat in the water yet to see how good it works. And yes drilling thru the balsa core "only" to expose the outer skin can be a challenge. Then you have to back fill around the angle mounting cup with resin, also kinda tricky on a 24deg bottom. But it's mounted in there now..
After the fact, I'd go a transom mount next time and save the aggravation...