Re: [PSUBS-MAILIST] teathers

Having done many scuba dives in the area lakes, I have leaned to watch my compass and count my kick cycles. ...all to no avail. I still come up and have to turn around to find the boat. :)

I do not have any specific site in mind but I know that there are people working on integrating low cost accelerometers into ROV's in order to calculate position. A search on ROV accelerometer might turn up something DIY. Let me know if you find something.

A low cost solution by integrating a digital compass, a sensor connected to the thruster speed circuit and a basic chip to run a dead reckoning. Some school kids have likely already done this too.

Even lower cost is a topology map of the bottom, compass and depth gauge. Works good in lakes with rough terrain, but would suck in Florida once you could not see a coral head.

Please let me know if you have anything good, and cheap. :) Thanks --Doug J, Tulsa OK

Doug thanks for the link to drag equation.

I have not run the numbers, don't have them yet, but just looking

at it surprises me.

Which brings me to a point on navigation and communication.

Without surface antenna's any way to accomplish accurate

navigation?

I know there are ways of using GPS and WAAS underwater at depths

but I don't think the navy will loan me the equipment.

And also thanks for the side info on the page

thrust = 35-40lbs per HP

I am sure, this is the first simple conversion it helps us dummies a lot.

Dean

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