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Old 09-16-2018, 04:49 PM   #1
SpearMax
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Question Hmmm.......Is underwater GPS feasible with this?

How Wireless Water-to-Air Communication Could Revolutionize Marine Research

Smithsonian

https://www.smithsonianmag.com/innov...rch-180970217/
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Old 09-18-2018, 12:50 PM   #2
mactrac
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Re: Hmmm.......Is underwater GPS feasible with this?

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Originally Posted by SpearMax View Post
How Wireless Water-to-Air Communication Could Revolutionize Marine Research

Smithsonian

https://www.smithsonianmag.com/innov...rch-180970217/
Feasible, yes, I guess. But to get GPS underwater, there would have to be a network of satellites equipped with antenna that broadcast a dedicated radar signal for the underwater receptors. Can't imagine that happening, even on a military level (no doubt subs have are existing means of fixing their positions using surface buoys etc).

I have heard there are some interesting developments on using inertial navigation for underwater applications that would extrapolate a diver's position based on movement away from a known GPS position on the surface. It's still not ready for the consumer market but I think it's the best chance for "underwater GPS" eventually.

https://ieeexplore.ieee.org/document/4570032/

Last edited by mactrac; 09-18-2018 at 12:56 PM. Reason: Add link
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Old 09-20-2018, 06:02 PM   #3
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Re: Hmmm.......Is underwater GPS feasible with this?

I guess it depends on what you are wanting GPS underwater for. If you want to navigate by GPS, that's not currently possible, but if you want to mark an underwater structure that you found while diving, not only is it possible but I've been doing it for years.

You need a waterproof to depth container for your GPS (I use an Otterbox rated for 150fsw), and a hand reel. You turn on the GPS before your dive, place it inside the case and clip it onto your BC before going in. When you descend it loses signal, when you find a structure you want to mark, send it to the surface, it gets a fix....give it about 5 minutes, then pull it back down and it'll log that position on your track log or you can just write down the last lat/lon on your slate. I first developed this technique when I was doing a mapping project for my DM certification. Works great!
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Old 09-20-2018, 06:55 PM   #4
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Re: Hmmm.......Is underwater GPS feasible with this?

Yea, it's possible but the data speeds underwater will be severely reduced creating serious lag. Also, the size of the unit will be significantly increased. IMO, it would be an unsatisfactory endeavor...a pipe dream.
A much more practical solution would be an antenna for it that floats on the surface as you move around. I personally don't see a viable application except maybe search rescue missions in dirty moving water...then again you're at the mercy of your antenna location on the surface.
The author appears to be just reaching for a story.
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