<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1540996335305_13861"><span></span></div><div id="yui_3_16_0_ym19_1_1540996335305_13860">Alan,</div><div id="yui_3_16_0_ym19_1_1540996335305_13859"><br></div><div id="yui_3_16_0_ym19_1_1540996335305_13434">For the most part, it's about accuracy. This device has been around for many years, it's true, but that's because the specs are very good. It also performs all the calculations spitting out compass heading, yaw, pitch, in a directly usable format as well as being tilt compensated up to 60 degrees (I think). It can be mounted in three different planes which isn't so important from a PSUBS perspective but could be critical in some applications. So for basic compass purposes it is definitely a Cadillac.</div><div id="yui_3_16_0_ym19_1_1540996335305_13434"><br></div><div id="yui_3_16_0_ym19_1_1540996335305_13434" dir="ltr">There are many cheaper solid state compasses available but few are tilt-compensated and even a little bit of tilt has a major impact on the measurement output. The tilt-compensation on the HMC-6343 really works well and it was important to me to know that the output I am seeing is as accurate as possible despite any wave action on the surface, or small balance issues under water.</div><div id="yui_3_16_0_ym19_1_1540996335305_13434"><br></div><div id="yui_3_16_0_ym19_1_1540996335305_13434">Any IMU with 9 degrees of freedom can be used to accomplish the same thing but they all output raw data that needs to be calculated, twisted, torqued, torched, hacksawed, and then welded back together again. The HMC-6343 does that all internally and is simple to configure and program.</div><div id="yui_3_16_0_ym19_1_1540996335305_13434"><br></div><div id="yui_3_16_0_ym19_1_1540996335305_13434">The link I showed is a Canadian outlet so price is $188(CAD). USA suppliers have them for $159(US) although they go into short supply occasionally. Add on an arduino for $35 and a bit of time programming, and you have a nice accurate compass for less than $200(US).</div><div id="yui_3_16_0_ym19_1_1540996335305_13434"><br></div><div id="yui_3_16_0_ym19_1_1540996335305_13434" dir="ltr">I have mine mounted in a small 1 inch PVC pipe with caps on both ends. I will probably fill it with epoxy but I suspect the 1-ATM pvc will hold up fine for the depths I'll be at. And yes, it will be mounted externally, probably 3 feet or so away from the metal hull. However, with programming I can filter any deflection offset caused by the metal hull.</div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1540996335305_13169"><br></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1540996335305_13169">Jon<br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1540996335305_13179" style="display: block;"> <div style="font-family: times new roman, new york, times, serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1540996335305_13178"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1540996335305_13177"> <div dir="ltr" id="yui_3_16_0_ym19_1_1540996335305_13176"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1540996335305_13234"> <hr size="1" id="yui_3_16_0_ym19_1_1540996335305_13233"> <b><span style="font-weight:bold;">From:</span></b> Alan via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, October 30, 2018 10:46 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] compass<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1540996335305_13592"><br><div id="yiv7322769624"><div id="yui_3_16_0_ym19_1_1540996335305_13591"><div></div><div id="yui_3_16_0_ym19_1_1540996335305_13599">Jon,</div><div id="yui_3_16_0_ym19_1_1540996335305_13598">I have to buy a compass some time so looked it up but it's pretty expensive</div><div id="yui_3_16_0_ym19_1_1540996335305_13596">at $188-. I also saw a video on it dated 2010, so it's at least 8 years old.</div><div id="yui_3_16_0_ym19_1_1540996335305_13595">There are modules for less than $20- but not tilt compensated.</div><div id="yui_3_16_0_ym19_1_1540996335305_13594">It does say it is "high end" but is there much difference between a cheap</div><div id="yui_3_16_0_ym19_1_1540996335305_13593">& expensive compass? ( I know nothing about this).</div><div id="yui_3_16_0_ym19_1_1540996335305_13590">The thought came to mind that you could possibly cover it with resin &</div><div id="yui_3_16_0_ym19_1_1540996335305_16473">mount it outside the hull away from magnetic interference.</div><div>Alan</div><div id="yui_3_16_0_ym19_1_1540996335305_16474"> </div><div class="yiv7322769624yqt3474772059" id="yiv7322769624yqt13016"><div id="yui_3_16_0_ym19_1_1540996335305_16475"><br clear="none">On 31/10/2018, at 1:36 PM, Jon Wallace via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite" id="yui_3_16_0_ym19_1_1540996335305_16478"><div id="yui_3_16_0_ym19_1_1540996335305_16477"><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:16px;" id="yui_3_16_0_ym19_1_1540996335305_16476"><div><span></span></div><div class="yiv7322769624qtdSeparateBR" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13673">Hank,</div><div class="yiv7322769624qtdSeparateBR" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13673"><br clear="none"></div><div class="yiv7322769624qtdSeparateBR" dir="ltr" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13673">I use HMC6343 tilt compensated compass from Honeywell, with arduino or Raspberry pi microprocessor. Display can be in many formats. These are sometimes hard to get but looks like CANAKIT has some.</div><div class="yiv7322769624qtdSeparateBR" dir="ltr" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13673"><br clear="none"></div><div class="yiv7322769624qtdSeparateBR" dir="ltr" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13673"><a rel="nofollow" shape="rect" class="yiv7322769624enhancr2_84460845-d5aa-9b42-8582-a8f91b958599" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13861" target="_blank" href="https://www.canakit.com/compass-with-tilt-compensation-hmc6343-com-08951.html">Compass with Tilt Compensation - HMC6343</a><br clear="none"></div><div class="yiv7322769624qtdSeparateBR" dir="ltr" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13673"><br clear="none"></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13872"><br clear="none"></div><div class="yiv7322769624yahoo-link-enhancr-card yiv7322769624ymail-preserve-class yiv7322769624ymail-preserve-style" dir="ltr" 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12px;vertical-align:top;"> </td><td colspan="1" rowspan="1" style="vertical-align:middle;padding:16px 12px;width:99%;"> <h2 class="yiv7322769624card-title" style="font-size:16px;line-height:19px;margin:0 0 4px 0;font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;">Compass with Tilt Compensation - HMC6343</h2> <div class="yiv7322769624card-description" style="font-size:11px;line-height:15px;color:#999;">Compass with Tilt Compensation - HMC6343</div> </td><td colspan="1" rowspan="1" style="text-align:right;padding:16px 12px 16px 0;"> </td></tr></tbody></table> </td></tr></tbody></table> </td></tr></tbody></table> </a></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13921"><br clear="none"></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13921"><br clear="none"></div><div class="yiv7322769624qtdSeparateBR" dir="ltr" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13673"><br clear="none"><br clear="none"></div><div class="yiv7322769624yahoo_quoted" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13615" style="display:block;"> <div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13614" style="font-family:times new roman, new york, times, serif;font-size:16px;"> <div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13613" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13715"> <font id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13745" size="2" face="Arial"> </font><hr id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13752" size="1"> <b><span style="font-weight:bold;">From:</span></b> hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> irox via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Monday, October 29, 2018 10:48 PM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] compass<br clear="none"> </div> <div class="yiv7322769624y_msg_container" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13612"><br clear="none"><div id="yiv7322769624"><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13618"><div class="yiv7322769624ydp9219440dyahoo-style-wrap" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13617" style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13744">Ian, </div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13743">Thank you, sorry about the sharp bracket. I will mount the new one on a plastic pole behind the CT</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13742">Hank</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13616"><br clear="none"></div>
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<div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13620" style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div class="yiv7322769624yqt8718038792" id="yiv7322769624yqt38936"><div>
On Monday, October 29, 2018, 6:43:07 PM MDT, irox via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
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<div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13619"><br clear="none"></div>
<div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13741"><br clear="none"></div>
<div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13624"><div id="yiv7322769624"><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13623"><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13622" style="font-size:13px;color:rgb(0, 0, 0);font-family:arial, sans-serif;"><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13725"><br clear="none"></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13621">Hi Hank!</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13625"><br clear="none"></div><div>you could google for "Fluxgate compass" and see what you're comfortable with from an electronics point of view.</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13626"><br clear="none"></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13939">You could build your own for ~$50 ($15 for compass, ~ $10 for microcontroller, ~$20 for a display):</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13627"><a rel="nofollow" shape="rect" target="_blank" href="https://www.adafruit.com/product/1120">https://www.adafruit.com/product/1120</a></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13628"><br clear="none"></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13630">But I imagine you'd prefer something more turn key, like:</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13631"><a rel="nofollow" shape="rect" target="_blank" href="https://www.starmarinedepot.com/clipper-compass-system-w%2Fremovable-fluxgate-sensor.html">https://www.starmarinedepot.com/clipper-compass-system-w%2Fremovable-fluxgate-sensor.html</a></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13632"><br clear="none"></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13633">The sensor would need mounted outside, away from the hull, like a regular compass.</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13635"><br clear="none"></div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13636">Cheers!</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13637"> Ian.</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13638">P.S.: Please make it less sharp that the current compass mounting bracket on Gamma. :-)<br clear="none"></div><br clear="none"><blockquote id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13639" style="padding-left:5px;margin-left:0px;border-left:#0000ff 2px solid;font-weight:normal;font-style:normal;text-decoration:none;font-size:10pt;font-family:arial, sans-serif;color:black;">-----Original Message-----
<br clear="none">From: hank pronk via Personal_Submersibles
<br clear="none">Sent: Oct 29, 2018 5:23 PM
<br clear="none">To: Personal Submersibles General Discussion
<br clear="none">Subject: [PSUBS-MAILIST] compass
<br clear="none"><br clear="none"><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13643">Hi All,</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13644">It is time to deal with a compass for Gamma. I would like a solid state compass with no moving parts. Jon, I think you mentioned I could do something for 200 dollars? Any ideas are welcome.</div><div id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13645">Hank</div><div class="yiv7322769624ydpf111d0cyahoo-style-wrap" style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;"></div></blockquote></div></div></div>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13646" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" id="yiv7322769624yui_3_16_0_ym19_1_1540945853448_13647" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
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</div></div></div><div class="yiv7322769624yqt8718038792" id="yiv7322769624yqt43671">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br clear="none"><br clear="none"></div> </div> </div> </div></div></div></blockquote></div><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote></div></div><div class="yqt3474772059" id="yqt11054">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>