Thanks Guys!
All are great ideas! I already have a depth sensor accurate to 1/2" and the thought was to use a second pressure sensor mounted in a torpedo tube to look at the water pressure on the bow. Where I am stuck is how to figure out how to conver the incomming pressure to speed? I also have temperature sensors. My first guess and I could be completely wrong is that the depth sensor would be the same as the "static" pressure and that the static pressure is subtracted from the incomming pressure? I just do not have any working knowledge of how speed is done.

Best, Ed