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

[via Personal_Submersibles]

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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