I think that the max depth is about 50'? There is a pressure sensor to prevent the sub from going too deep. R/C subs operate at 54 MHZ which has little difficulty penetrating water. The video camera system for the periscope operates at 1.2 GHZ. FYI 2.4 GHZ is the frequency for microwave ovens so to use this frequency would result in you only warming the water around your antenna! I work at Fox Television and have a ham radio license so a friend of mine and I designed an antenna that sends the video in an up direction only so the periscope will work underwater which has been tested. Every 33' the water pressure doubles from surface pressure so if you only used one pressure sensor you would be seeing the depth as speed when stationary. I think differential pressure is the way to go, water pressure on the bow as you move minus the pressure at depth. What I do not know how to calculate is velocity. Pictures are similar to mine.

Thanks to all and best wishes, Ed

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