Review on Depth, Temperature, and Speed Transom Mount by Robert Lee

I am using this Airmar P66 with a Garmin 441S GPS/Fishfinder set exactly as recommended by Garmin and Airmar. This converter doesn't work very well on my 17 foot Boston Whaler. It loses ground lock above 20 mph. Airmar recommended increasing the angle and ensuring the device is well submerged. I did both with no improvement. Also, even when decelerating to a stop, the 441S and the transducer block do not achieve ground lock until I reset the 441S. I'll try moving the unit to a different position on the transom in as little turbulent water as possible to try and improve bottom locking, although I'm not optimistic. None of the service organizations offered any advice other than changing the location of the transducer, which is difficult to do with a boat in the water during the season. I am very disappointed in the lack of performance of this system based on the step by step installation guide. In addition, the P66 is comparatively large and acts as a trim tab, raising the starboard side of the boat it is mounted on. Each boat and rig is unique, perhaps the best experience. As I said, my experience is very bad.