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<DIV><FONT size=3>Hi Hank,</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>I'm a bit delayed in getting back to you. Below are some
links regarding Inertial Navigation Systems (INS). Some are specifically
designed for underwater applications. The modules have become
quite small (1" square). My desire is to have the entire track display
onscreen and download it to a thumb drive at the end of the mission.
</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>One of the advantages of 3-axis INS is that it can provide
heading, depth, rate of ascent/descent, speed independent of current, drift,
tilt, etc.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Obviously a starting point has to be established on the
surface (GPS or other position reference and compass heading).
However in many situations such as when operating from a lake
ramp, you could just label the launch as "Starting Point" and call the
initial heading "0" or whatever no matter which direction you're headed
assuming you're going to be returning to the starting point.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>SBG Systems has been making rapid advancements in accuracy and
cost reduction for INS. However inertial changes in small, manned
submersibles are much smaller than in submarines, boats, and aircraft. If
I were to the point of putting together a system, I would contact them for
advice on which components to use to build it.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Jim</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV>
<DIV><FONT size=3>SBG Systems:</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><A
href="http://www.sbg-systems.com/products/subsea-inertial-systems-overview">http://www.sbg-systems.com/products/subsea-inertial-systems-overview</A></DIV>
<DIV> </DIV>
<DIV><A
href="http://www.sbg-systems.com/products/inertial-systems-overview">http://www.sbg-systems.com/products/inertial-systems-overview</A></DIV>
<DIV> </DIV>
<DIV><A
href="http://www.sbg-systems.com/docs/Article-SBG-SYSTEMS-ON&T.pdf">http://www.sbg-systems.com/docs/Article-SBG-SYSTEMS-ON&T.pdf</A></DIV>
<DIV> </DIV>
<DIV><A
href="http://www.sbg-systems.com/products/ig-30-3d-compass">http://www.sbg-systems.com/products/ig-30-3d-compass</A></DIV>
<DIV> </DIV></DIV>
<DIV><FONT size=3>Sparkfun:</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><A
href="https://www.sparkfun.com/products/12916">https://www.sparkfun.com/products/12916</A></DIV>
<DIV> </DIV>
<DIV><A
href="https://www.sparkfun.com/search/results?term=compass&what=products">https://www.sparkfun.com/search/results?term=compass&what=products</A></DIV>
<DIV> </DIV>
<DIV><FONT size=3>OceanServer:</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><A
href="http://www.oceanserver-store.com/">http://www.oceanserver-store.com/</A></DIV>
<DIV> </DIV>
<DIV><A
href="http://www.ocean-server.com/compass.html?gclid=CKHazZGbiLMCFQpgMgodAQgALg">http://www.ocean-server.com/compass.html?gclid=CKHazZGbiLMCFQpgMgodAQgALg</A></DIV>
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