Thanks Alain!
It is a great idea. This sensor is to measure the depth for a radio controlled submarine. It is one of a group of "sensors" that will be progammed into one big PIC. There is a tachometer on the port and starboard motors with temperature sensors, control for a sound module, a compass, internal flooding alarm, battery voltage and current draw, missile and torpedo status, and speed. Everything is to feed an on screen display as a overlay on the video from a periscope camera. The compass was my first project and turned out to be extremely accurate (.1 degrees). If you are interested, the compass is at http://www.robsonco.com/Dinsmore/Untitled_5.html.

Best, Ed