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<DIV>Alan,</DIV>
<DIV>That is really interesting. I got the impression that the smallest
package they sell is one surface unit with three under-water units.
However that might be negotiable.</DIV>
<DIV>Jim</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/24/2017 10:34:13 P.M. Central Daylight Time,
personal_submersibles@psubs.org writes:</DIV>
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style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV>Jim,</DIV>
<DIV id=AppleMailSignature>this is interesting, it's a diver tracking system
called diver 6.</DIV>
<DIV id=AppleMailSignature>The video gives a good overview Not sure of the
price.</DIV>
<DIV id=AppleMailSignature><A title=http://www.diver6.com/
href="http://www.diver6.com/">http://www.diver6.com/</A></DIV>
<DIV id=AppleMailSignature>Hope you get back on your project soon.</DIV>
<DIV id=AppleMailSignature>Alan<BR><BR>Sent from my iPad</DIV>
<DIV><BR>On 25/03/2017, at 2:41 PM, via Personal_Submersibles <<A
title=mailto:personal_submersibles@psubs.org>personal_submersibles@psubs.org</A>>
wrote:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV>
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<DIV>Alan,</DIV>
<DIV> </DIV>
<DIV>That's quite interesting. I haven't been familiar with acoustic
modems. In addition to positioning, I can appreciate that they would
have greater range capabilities for communication than the other (but much
cheaper) technology that we have accessible as amateurs</DIV>
<DIV> </DIV>
<DIV>I've had to pull way back from my focus on sub design and technology
for a good while. By the time I return I'm hoping you guys will be
field testing Inertial Navigation Systems and have a couple of
different configurations to share info on.</DIV>
<DIV> </DIV>
<DIV>Cheers,</DIV>
<DIV>Jim </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/24/2017 3:48:40 P.M. Central Daylight Time, <A
title=mailto:personal_submersibles@psubs.org>personal_submersibles@psubs.org</A>
writes:</DIV>
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style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV>Jim,</DIV>
<DIV id=AppleMailSignature>just had a look in Sea Technology magazine
March edition, ( free online magazine)</DIV>
<DIV id=AppleMailSignature>& saw this...</DIV>
<DIV id=AppleMailSignature><A
title=http://www.link-quest.com/html/intro2.htm
href="http://www.link-quest.com/html/intro2.htm">http://www.link-quest.com/html/intro2.htm</A></DIV>
<DIV id=AppleMailSignature>It is a small module that tracks an underwater
vehicle, has GPS & communicates</DIV>
<DIV id=AppleMailSignature>to the vehicle via an onboard PC or whatever.
Haven't studied it, but I am sure</DIV>
<DIV id=AppleMailSignature>it could translate the underwater vehicles
position to maps on the vehicles PC.</DIV>
<DIV id=AppleMailSignature>These days you have GPS mapping apps on your
cel phone, so it wouldn't be too</DIV>
<DIV id=AppleMailSignature>hard. The next stage would be using the
position signal from the submarine to</DIV>
<DIV id=AppleMailSignature>control motors on the buoy to follow it. On
quad copters they have GPS & return</DIV>
<DIV id=AppleMailSignature>to start functions that return the quad copter
to it's launch position should it's</DIV>
<DIV id=AppleMailSignature>transmitter lose contact. So the sought of
technology to control the buoy thrusters</DIV>
<DIV id=AppleMailSignature>through position signals is alive & well
& cheap.</DIV>
<DIV id=AppleMailSignature> I won't be pursuing it, as I need
to make my sub first :)</DIV>
<DIV id=AppleMailSignature>Alan</DIV>
<DIV id=AppleMailSignature><BR><BR>Sent from my iPad</DIV>
<DIV><BR>On 25/03/2017, at 6:53 AM, Alan via Personal_Submersibles <<A
title=mailto:personal_submersibles@psubs.org>personal_submersibles@psubs.org</A>>
wrote:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV>
<DIV>Jim,</DIV>
<DIV>yes. Just an intermittent signal every 10 seconds or so. I
have</DIV>
<DIV>read about text type communication systems.</DIV>
<DIV>Here is a passage from a paper that talks about a buoy
device.</DIV>
<DIV><BR>
<DIV title="Page 2" class=page>
<DIV class=layoutArea>
<DIV class=column>
<P><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">An
underwater GPS is primarily a combination of a GPS and an acoustic
positioning system and consists of two types [12-19]: a sea surface buoy
system using a long baseline and carrying a GPS receiver, which can
track, monitor, and dynamically position underwater targets from a sea
surface, coastal land, and a plane and has a large operating range but
can only position underwater targets that carry acoustic transponders in
certain waters; and a system which uses a mother ship equipped with a
short baseline or ultra short baseline transceiver and a GPS receiver,
which is mobile and flexible but also can only position targets equipped
with acoustic transponders. Therefore, this paper proposes a way of
positioning combining an ultra short baseline, a forward-looking sonar
and a GPS receiver, overcoming the limitation of the existing underwater
GPS positioning technology that it can only position targets equipped
with acoustic transponders and realizing the real-time positioning of
the longitude and latitude coordinates of any unknown targets in any
waters in the WGS84 ellipsoidal coordinate system, and it is also highly
mobile.</SPAN></P>
<P><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Alan </SPAN></P></DIV></DIV></DIV>
<DIV>Sent from my iPad</DIV></DIV>
<DIV><BR>On 25/03/2017, at 6:06 AM, via Personal_Submersibles <<A
title=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>Alan,</FONT></DIV>
<DIV><FONT size=3>Transmit GPS positions wirelessly where?
You didn't mean down to the sub, did you?</FONT></DIV>
<DIV><FONT size=3>Jim</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/23/2017 10:07:37 P.M. Central Daylight Time,
<A
title=mailto:personal_submersibles@psubs.org>personal_submersibles@psubs.org</A>
writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>
<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
title=mailto:personal_submersibles@psubs.org>personal_submersibles@psubs.org</A>>
wrote:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV>
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color=#000000 size=2 face=Arial>
<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
title=http://www.seismic.com.au/assets/pdf/SBG_Systems-Ellipse_Series_Brochure.pdf
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>
<DIV><FONT size=3></FONT> </DIV>
<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>
<DIV><FONT size=3></FONT> </DIV>
<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>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Jim T.</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/23/2017 7:55:50 P.M. Central Daylight
Time, <A
title=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>
<BLOCKQUOTE cite=mid:20170323154013.EA88CFB6@m0087798.ppops.net
type="cite">
<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: Arial, sans-serif">
<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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