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

[via Personal_Submersibles]

Alan,
Transmit GPS positions wirelessly where?  You didn't  mean down to the sub, 
did you?
Jim
 
 
In a message dated 3/23/2017 10:07:37 P.M. Central Daylight Time,  
personal_submersibles at psubs.org writes:

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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