[PSUBS-MAILIST] New Generation Inertial Sensors - Twice as Accurate

[Alan via Personal_Submersibles]

Jim,
re the tow behind buoy (pronounced boy); it would be possible to make a 
buoy with motors on it that tracked your sub & transmitted GPS positions
wirelessly. Minn kota have a system that controls their thruster to keep
a boat steady on a certain coordinate. 
Alan

Sent from my iPad

> On 24/03/2017, at 3:43 PM, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Here's a link that gives quite a bit of information including a reference to their Windows-based software.  Once you open the link, the more you scroll down the more you will see; it goes a long way! http://www.seismic.com.au/assets/pdf/SBG_Systems-Ellipse_Series_Brochure.pdf
>  
> GPS is great as a starting point before you submerge and for telling you where you are once you surface.  Too bad radio signals don't propagate so well under water.  In the past we've discussed mounting a GPS antenna on a Diver Below buoy with a cable running to the sub.  I don't recall what was said regarding theoretical depth limitations for such a setup as well as the hydrodynamics of towing it.
>  
> It would be really interesting to see how well your INS position matches up with your GPS when you resurface.  I like the idea of knowing just where you are with reasonable precision when submerged, being able to return to a precise location on another day, being able to search or survey methodically, navigating from A to B to C, etc.
>  
> Jim T.
>  
> In a message dated 3/23/2017 7:55:50 P.M. Central Daylight Time, personal_submersibles at psubs.org writes:
>> On 3/23/2017 6:40 PM, Brian Cox via Personal_Submersibles wrote:
>> There needs to be an underwater GPS  !!
> 
> I remember a discussion, long ago, about a GPS antenna on a mast.  I don't recall any resolution.
> 
> 
> Mike
> 
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> 
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