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:rofl: !!!cancun mark:I actually have an underwater cellphone.
I bought it for two dollars at "toys R us" and keep it in my BCD pocket, whenever someones computer or watch starts beeping UW, I drag it out and pretend to talk, nod my head etc.
It fools about 50% of divers.
justleesa:One of our instructors has a UW GPS and it works up to 50 fsw...don't know the brand and it looks military to me.
runvus4:I figure the Navy has to have developed somehing to assist with undewater navigation. I was thinking along the lines of of ULF wave triangulation. The problem with that is that those waves travel at different speeds through waters with differing salt content which would make the system fairly inaccurate without a very large number of reference points. Also ULF waves have been linked in a corrolary (not causal) fashion with disruption to marine life.
Sorry, I missed this one.DoUDive2:Ask him what it is and where he got it. I like to keep up to date on things like this.
Chris
Needle, ball, air speed, magnetic heading, and cellestial navigation.Ragnar:Don't know a thing about U-boats, but I bet they use some type of inertial nav. Once it's initialized with GPS, or the coordinates are input manually on the surface and it knows it's present position, all future movement can be calculated from the forces felt on the laser gyros. In airplanes there are sometimes three of these which all cross check each other. Now the question is.........how in the hell did they do it back in the forties!!!....Hmmmm......
Ragnar:... all future movement can be calculated from the forces felt on the laser gyros. In airplanes there are sometimes three of these which all cross check each other. Now the question is.........how in the hell did they do it back in the forties!!!....Hmmmm......