<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I worked with a volunteer who developed a low cost system with a small screen and a low cost sensor of the class used in cell phones. The display had a "start" button to reset, and displayed a track of the path followed. He did a great job of it, but our conclusion was the sensor just didn't have sufficient accuracy yet. This was about 2/3 years ago.<br><br>Best,</div><div><br></div><div>Alec<br><div><br></div></div><div><br>On Dec 12, 2014, at 10:07 PM, Hugh Fulton 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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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Jim,<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That is a really great bit of information you have posted. I am really keen to progress something that is afforadable. Has anyone put together an INS system which is low cost?<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I was in touch with someone a couple of years ago who was going to do a system for less than half what is currently available but have not heard anything more. Any other leads?<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards, Hugh <o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><div><p class="MsoNormal"><span lang="EN-NZ" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Personal_Submersibles [<a href="mailto:personal_submersibles-bounces@psubs.org">mailto:personal_submersibles-bounces@psubs.org</a>] <b>On Behalf Of </b>via Personal_Submersibles<br><b>Sent:</b> Saturday, 13 December 2014 3:05 p.m.<br><b>To:</b> <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br><b>Subject:</b> [PSUBS-MAILIST] Inertial navigation, 3-axis<o:p></o:p></span></p></div></div><p class="MsoNormal"><o:p> </o:p></p><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">Hi Hank,</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">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. </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">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.</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">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.</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">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.</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">Jim</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">SBG Systems:</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><a href="http://www.sbg-systems.com/products/subsea-inertial-systems-overview">http://www.sbg-systems.com/products/subsea-inertial-systems-overview</a><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><a href="http://www.sbg-systems.com/products/inertial-systems-overview">http://www.sbg-systems.com/products/inertial-systems-overview</a><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><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><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><a href="http://www.sbg-systems.com/products/ig-30-3d-compass">http://www.sbg-systems.com/products/ig-30-3d-compass</a><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">Sparkfun:</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span 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class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p></div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><br><br>__________ Information from ESET NOD32 Antivirus, version of virus signature database 10870 (20141212) __________<br><br>The message was checked by ESET NOD32 Antivirus.<br><br><a href="http://www.eset.com">http://www.eset.com</a><o:p></o:p></span></p></div> <br><br>__________ Information from ESET NOD32 Antivirus, version of virus signature database 10870 (20141212) __________<br><br>The message was checked by ESET NOD32 Antivirus.<br><br><a href="http://www.eset.com">http://www.eset.com</a><br> </div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>