<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Jim,</div><div id="AppleMailSignature">re the tow behind buoy (pronounced boy); it would be possible to make a </div><div id="AppleMailSignature">buoy with motors on it that tracked your sub & transmitted GPS positions</div><div id="AppleMailSignature">wirelessly. Minn kota have a system that controls their thruster to keep</div><div id="AppleMailSignature">a boat steady on a certain coordinate. </div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br>Sent from my iPad</div><div><br>On 24/03/2017, at 3:43 PM, via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<div><font size="3">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! <a href="http://www.seismic.com.au/assets/pdf/SBG_Systems-Ellipse_Series_Brochure.pdf">http://www.seismic.com.au/assets/pdf/SBG_Systems-Ellipse_Series_Brochure.pdf</a></font></div>
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<div><font size="3">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.</font></div>
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<div><font size="3">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.</font></div>
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<div><font size="3">Jim T.</font></div>
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<div>In a message dated 3/23/2017 7:55:50 P.M. Central Daylight Time,
<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> writes:</div>
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<div class="moz-cite-prefix">On 3/23/2017 6:40 PM, Brian Cox via
Personal_Submersibles wrote:<br></div>
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<div>There needs to be an underwater GPS
!!</div></div></blockquote><br>I remember a discussion, long ago, about a GPS
antenna on a mast. I don't recall any
resolution.<br><br><br>Mike<br><br>
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