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Old 23-05-2016, 06:09   #1
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Underwater navigation system

Check this out... Pretty cool!

DARPA program plunges into underwater positioning system - Gizmag

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Old 23-05-2016, 06:30   #2
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Re: Underwater navigation system

I think the microwave flask might be a tad more useful for a solo yachtsman on a long and cold night watch.

Hand-held microwave takes home convenience into the wild
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Old 23-05-2016, 06:56   #3
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Re: Underwater navigation system

Back in my time on SSBN’s (1965-1972), my boat refit in Rota, Spain and patrolled in the Med.

We navigated underwater by Ships Inertial Navigation System (SINS). This was a ship contained system that worked without external signals. The gyros did have to be reset periodically and we did this in several ways.

We trailed a wire antenna on the surface to receive LORAN C signals and compared that position with SINS to calibrate it. Trouble with this was that we would often break the wire at depth or if aggressively maneuvering which required deploying spare wires. Also it wasn’t always as stealthy as we hoped when a flock of birds would decide to hitch a ride on the wire while we were moving.

We also had a TRANSAT System where we would come up to periscope depth at night and track a single satellite for about eight minutes and then generate a pretty accurate fix also used to calibrate SINS.

In addition, we had a bottom contour system but seldom used it as it was pretty unreliable.

Lastly we had a Type 11 periscope with a built in sextant controlled by computer that required a trip to periscope depth. This wasn't so much a position device as a check on SINS heading. Back then the accuracy of a ballistic missile depended on it knowing where it was starting from and leaving there on an accurate heading. Each missile also had its own on board SINS.

Given that we didn’t even have such a thing as an electronic calculator, I imagine today that systems have progressed way beyond what was available then so I wonder what problem needs to be solved?

There has to be more to this article because any system that required a submarine to transmit would be a non starter. Even passive, the signals would have to be loud enough to be heard but not so loud as to overpower the sounds that the boat is actually listening for.
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