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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Alan,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>I have just a simple
readout. But the compass sensor can be fed into more sophisticated navigation electronics
and can control a rudder actuator.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Emile<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Van:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b><span
style='font-weight:bold'>Namens </span></b>Alan James via Personal_Submersibles<br>
<b><span style='font-weight:bold'>Verzonden:</span></b> zondag 7 december 2014
19:32<br>
<b><span style='font-weight:bold'>Aan:</span></b> Personal Submersibles General
Discussion<br>
<b><span style='font-weight:bold'>Onderwerp:</span></b> Re: [PSUBS-MAILIST]
gyroscope/fluxgate compass</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<div id="yui_3_16_0_1_1417976318221_3188">
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Helvetica><span style='font-size:12.0pt;font-family:Helvetica;color:black'>Hi
Emile,</span><o:p></o:p></span></font></p>
</div>
<span id="yui_3_16_0_1_1417976318221_3189">
<div id="yui_3_16_0_1_1417976318221_3190">
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Helvetica><span style='font-size:12.0pt;font-family:Helvetica;color:black'>did
you have it displaying on a Raymarine screen?</span><o:p></o:p></span></font></p>
</div>
<span id="yui_3_16_0_1_1417976318221_3191">
<div id="yui_3_16_0_1_1417976318221_3192">
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Helvetica><span style='font-size:12.0pt;font-family:Helvetica;color:black'>Can
I feed this in to a plc & display it on a screen easily?</span><o:p></o:p></span></font></p>
</div>
<div id="yui_3_16_0_1_1417976318221_3192">
<p class=MsoNormal style='background:white'><font size=3 color=black
face=Helvetica><span style='font-size:12.0pt;font-family:Helvetica;color:black'>It
is saying......<o:p></o:p></span></font></p>
</div>
<h3 style='margin:0cm;margin-bottom:.0001pt;background:white;vertical-align:
baseline;font-stretch: inherit;line-height:inherit'><b><font size=2
color="#9a0036" face=Verdana><span style='font-size:10.5pt;font-family:Verdana;
color:#9A0036'>COMPASS<o:p></o:p></span></font></b></h3>
<div style='font-stretch: inherit' id="yui_3_16_0_1_1417976318221_3508">
<p class=MsoNormal style='line-height:12.0pt;background:white;vertical-align:
baseline'><font size=1 color="#333333" face=Verdana><span style='font-size:
9.0pt;font-family:Verdana;color:#333333'> <o:p></o:p></span></font></p>
</div>
<table class=MsoNormalTable border=0 cellpadding=0 width=745 style='width:558.75pt'
dropzone=copy id="yui_3_16_0_1_1417976318221_3505">
<tr id="yui_3_16_0_1_1417976318221_3503">
<td style='padding:0cm 0cm 0cm 0cm;cursor:default'
id="yui_3_16_0_1_1417976318221_3507">
<p class=MsoNormal style='line-height:11.1pt'><font size=1 color="#333333"
face=Verdana><span style='font-size:9.0pt;font-family:Verdana;color:#333333'> <img
width=414 height=319 id="yui_3_16_0_1_1417976318221_3506"
src="http://www.raymarine.com/uploadedImages/Products/Fishfinders/Transducers/Instrument_Transducers/fluxgate%20to%20ST60plus.jpg"
alt="Fluxgate Compass transducer to ST60+" draggable=false
title="Fluxgate Compass transducer to ST60+" class=""
data-id=e610a5c1-9546-27bd-a33c-88d0b4537e98><o:p></o:p></span></font></p>
</td>
<td style='padding:0cm 0cm 0cm 0cm;cursor:default'>
<p class=MsoNormal style='line-height:11.1pt'><font size=1 color="#333333"
face=Verdana><span style='font-size:9.0pt;font-family:Verdana;color:#333333'> <o:p></o:p></span></font></p>
</td>
<td style='padding:0cm 0cm 0cm 0cm;cursor:default'
id="yui_3_16_0_1_1417976318221_3502">
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'>
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><strong><b><font
size=1 color="#333333" face=inherit><span style='font-size:9.0pt;font-family:
inherit;color:#333333;border:none windowtext 1.0pt;padding:0cm'>SeaTalk</span></font></b><span
style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'></strong><strong><b><font size=1 color="#333333"
face=inherit><span style='font-size:7.0pt;font-family:inherit;color:#333333;
border:none windowtext 1.0pt;padding:0cm'>1</span></span></font></b></strong><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'><o:p></o:p></span></font></p>
</div>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'>
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'> <o:p></o:p></span></font></p>
</div>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'>
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'>The </span></font><strong style='font-size:inherit;
font-style:inherit;font-variant:inherit;font-stretch: inherit;line-height:
inherit'><b><font size=1 color="#333333" face=inherit><span style='font-size:
9.0pt;font-family:inherit;color:#333333;border:none windowtext 1.0pt;
padding:0cm'>Fluxgate Compass</span></font></b></strong><font size=1
color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
color:#333333'> transducer is compatible with the ST40 and ST60+
instruments on the SeaTalk</span></font><font size=1 color="#333333"
face=inherit><span style='font-size:7.0pt;font-family:inherit;color:#333333;
border:none windowtext 1.0pt;padding:0cm'><span style='font-style:inherit;
font-variant:inherit;font-weight:inherit;font-stretch: inherit'>1</span></span></font><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'> network. The transducer simply connects to the
back of one of the following instruments:<o:p></o:p></span></font></p>
</div>
<ul style='margin-top:0cm;font-style:inherit;font-variant:inherit;font-weight:
inherit;font-stretch: inherit;line-height:inherit' type=disc
id="yui_3_16_0_1_1417976318221_3501">
<li class=MsoNormal style='color:#333333;line-height:12.0pt;mso-list:l0 level1 lfo1;
vertical-align:middle;font-style:inherit;font-variant:inherit;
font-weight:inherit;font-stretch: inherit'><font size=1 color="#333333"
face=Verdana><span style='font-size:9.0pt;font-family:Verdana'>ST40
Compass<o:p></o:p></span></font></li>
<li class=MsoNormal style='color:#333333;line-height:12.0pt;mso-list:l0 level1 lfo1;
vertical-align:middle;font-style:inherit;font-variant:inherit;
font-weight:inherit;font-stretch: inherit'
id="yui_3_16_0_1_1417976318221_3500"><font size=1 color="#333333"
face=Verdana><span style='font-size:9.0pt;font-family:Verdana'>ST60+
Compass<o:p></o:p></span></font></li>
</ul>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'>
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'> <o:p></o:p></span></font></p>
</div>
</td>
</tr>
<tr id="yui_3_16_0_1_1417976318221_3653">
<td colspan=3 style='padding:0cm 0cm 0cm 0cm'
id="yui_3_16_0_1_1417976318221_3652">
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'>
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'> <o:p></o:p></span></font></p>
</div>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'>
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><strong><b><font
size=1 color="#333333" face=inherit><span style='font-size:9.0pt;font-family:
inherit;color:#333333;border:none windowtext 1.0pt;padding:0cm'>SeaTalk</span></font></b><span
style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'></strong><strong><b><font size=1 color="#333333"
face=inherit><span style='font-size:7.0pt;font-family:inherit;color:#333333;
border:none windowtext 1.0pt;padding:0cm'>ng</span></span></font></b></strong><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'><o:p></o:p></span></font></p>
</div>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit'>
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'> <o:p></o:p></span></font></p>
</div>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit' id="yui_3_16_0_1_1417976318221_3651">
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'>The </span></font><strong style='font-size:inherit;
font-style:inherit;font-variant:inherit;font-stretch: inherit;line-height:
inherit'><b><font size=1 color="#333333" face=inherit><span style='font-size:
9.0pt;font-family:inherit;color:#333333;border:none windowtext 1.0pt;
padding:0cm'>Fluxgate Compass</span></font></b></strong><font size=1
color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
color:#333333'> transducer is compatible with the <a
href="http://www.raymarine.com/view/?id=1250" title=i70 draggable=false
style='-webkit-tap-highlight-color: rgb(255, 94, 153)'><font color="#9a0036"><span
style='color:#9A0036;text-decoration:none'>i70 </span></font></a>, <a
href="http://www.raymarine.com/view/?id=621" title=ST70 draggable=false
style='-webkit-tap-highlight-color: rgb(255, 94, 153)'><font color="#9a0036"><span
style='color:#9A0036;text-decoration:none'>ST70 </span></font></a>and <a
href="http://www.raymarine.com/view/?id=227" title="ST70+" draggable=false
style='-webkit-tap-highlight-color: rgb(255, 94, 153)'><font color="#9a0036"><span
style='color:#9A0036;text-decoration:none'>ST70+ </span></font></a>instruments
on the SeaTalk</span></font><strong style='font-size:inherit;font-style:inherit;
font-variant:inherit;font-stretch: inherit;line-height:inherit'><b><font
size=1 color="#333333" face=inherit><span style='font-size:7.0pt;font-family:
inherit;color:#333333;border:none windowtext 1.0pt;padding:0cm'><span
style='font-size:inherit;font-style:inherit;font-variant:inherit;font-weight:
inherit;font-stretch: inherit;line-height:inherit'><span style='font-style:
inherit;font-variant:inherit;font-weight:inherit;font-stretch: inherit'>ng</span></span></span></font></b></strong><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'> network via an <a
href="http://www.raymarine.com/view/?id=3338"
title="iTC-5 transducer converter " draggable=false style='-webkit-tap-highlight-color: rgb(255, 94, 153)'><font
color="#9a0036"><span style='color:#9A0036;text-decoration:none'>iTC-5
transducer converter </span></font></a>(sold separately). The transducer
is connected to the iTC-5 which converts the transducer signals to SeaTalk</span></font><strong
style='font-size:inherit;font-style:inherit;font-variant:inherit;font-stretch: inherit;
line-height:inherit'><span style='font-size:inherit;font-style:inherit;
font-variant:inherit;font-weight:inherit;font-stretch: inherit;line-height:
inherit'><span style='font-style:inherit;font-variant:inherit;font-weight:
inherit;font-stretch: inherit'><b><font size=1 color="#333333" face=inherit><span
style='font-size:7.0pt;font-family:inherit;color:#333333;border:none windowtext 1.0pt;
padding:0cm'>ng</span></span></font></b></span></strong><font size=1
color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
color:#333333'>. The iTC-5 is then connected to your SeaTalk</span></font><strong
style='font-size:inherit;font-style:inherit;font-variant:inherit;font-stretch: inherit;
line-height:inherit' id="yui_3_16_0_1_1417976318221_3658"><span
style='font-size:inherit;font-style:inherit;font-variant:inherit;font-weight:
inherit;font-stretch: inherit;line-height:inherit'
id="yui_3_16_0_1_1417976318221_3657"><span style='font-style:inherit;
font-variant:inherit;font-weight:inherit;font-stretch: inherit'
id="yui_3_16_0_1_1417976318221_3656"><b><font size=1 color="#333333"
face=inherit><span style='font-size:7.0pt;font-family:inherit;color:#333333;
border:none windowtext 1.0pt;padding:0cm'>ng</span></span></font></b></span></strong><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'> backbone.<o:p></o:p></span></font></p>
</div>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit' id="yui_3_16_0_1_1417976318221_3654">
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'> <o:p></o:p></span></font></p>
</div>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit' id="yui_3_16_0_1_1417976318221_3655">
<p class=MsoNormal style='line-height:12.0pt;vertical-align:baseline'><font
size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'>Note that if your system contains an SPX autopilot the </span></font><strong
style='font-size:inherit;font-style:inherit;font-variant:inherit;font-stretch: inherit;
line-height:inherit'><b><font size=1 color="#333333" face=inherit><span
style='font-size:9.0pt;font-family:inherit;color:#333333;border:none windowtext 1.0pt;
padding:0cm'>Fluxgate Compass</span></font></b></strong><font size=1
color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
color:#333333'> should connect directly to the course computer and
not the iTC-5.<o:p></o:p></span></font></p>
</div>
<div style='font-style:inherit;font-variant:inherit;font-weight:inherit;
font-stretch: inherit' id="yui_3_16_0_1_1417976318221_3655">
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size=1 color="#333333" face=Verdana><span style='font-size:9.0pt;font-family:
Verdana;color:#333333'>Alan<o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:white'><b><font size=2 color=black
face=Arial id="yui_3_16_0_1_1417976318221_3197"><span style='font-size:10.0pt;
font-family:Arial;color:black;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> <st1:PersonName ProductID="Emile van Essen" w:st="on">Emile van
Essen</st1:PersonName> 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> Monday, December 8, 2014
2:19 AM<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [PSUBS-MAILIST]
gyroscope/fluxgate compass</span></font><font color=black face=Helvetica><span
style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=navy face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'>I got good
results with a (raymarine) fluxgate. The sensor is placed in the all
aluminium bow section ( <st1:metricconverter ProductID="0,9 Meter" w:st="on">0,9
Meter</st1:metricconverter> away from the hull) and the readout can placed
anywhere.</span></span></font><font color=black face=Helvetica><span
style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=navy face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'>It can
electronically compensate 10 or 12 deg deviation caused by the steel. The
sistership has the sensor in a short mast also with good results.</span></span></font><font
color=black face=Helvetica><span style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=navy face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><font
color=black face=Helvetica><span style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=navy face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'>Attached a
sketch of the pressuretight sensor housing.</span></font><font color=black
face=Helvetica><span style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><font
color=black face=Helvetica><span style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=navy face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'>Regards, Emile</span></font><font
color=black face=Helvetica><span style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=navy face=Arial><span
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color=black face=Helvetica><span style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><font
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<p class=MsoNormal style='background:white'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black;
font-weight:bold'>Van:</span></font></b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'> Personal_Submersibles
[mailto:personal_submersibles-bounces@psubs.org] <b><span style='font-weight:
bold'>Namens </span></b>" <st1:PersonName ProductID="Carsten Standfuß"
w:st="on">Carsten Standfuß</st1:PersonName> " via Personal_Submersibles<br>
<b><span style='font-weight:bold'>Verzonden:</span></b> woensdag 3 december
2014 20:46<br>
<b><span style='font-weight:bold'>Aan:</span></b> Personal Submersibles General
Discussion<br>
<b><span style='font-weight:bold'>Onderwerp:</span></b> Re: [PSUBS-MAILIST]
gyroscope compass</span></font><font color=black face=Helvetica><span
style='font-family:Helvetica;color:black'><o:p></o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
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<p class=MsoNormal style='background:white'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'>Gyros in aricraft are not north stable - they need a
magnetic compass or other device to set course. But they are okay
if you set course according to your GPS course before you dive. They can
hold the course for some hours with a movment of 2-4 deegre per hour. Okay for
a slow and small Psub. They are vaccum driven or electric. Vaccum driven you
can not use in a small submarine. (Or you need a silencer and eardrums as in
Spurdog). Electric you can use if it is a 12 or 24 V DC driven one. For other
voltage you need a special power converter. The Ebay units are sometimes cheap
- between 100-800 USD - but most of them work not proper. They are build
out of the planes for exact that reason and sold as they are and without any
waranty.. Size is around 100x100x400mm. Volume <st1:metricconverter
ProductID="4 Liters" w:st="on">4 Liters</st1:metricconverter> .. Good solution
if you buy a unit in aircraft condition with papers from a aircarft surplus dealer
with a working garanty. Make sure that they get not wet or 100% humidity. <br>
<br>
Gyros in ships are north stabilzed. The need around 40 Minutes to warm up. They
are much bigger - the smallest one are around 300 x 400 x <st1:metricconverter
ProductID="300 mm" w:st="on">300 mm</st1:metricconverter> . Volume at minimum <st1:metricconverter
ProductID="36 liter" w:st="on">36 liter</st1:metricconverter> . They need no
calibration or reference and they are stable over month/years. Problem is that
they normal switch on in a ship and never switch off.. If you switch of them -
make sure that you not move the sub in the next hours - otherwise they can be
damaged. They are expensive - about 30000 USD new and 3000-9000 USD second
hand. There life time is limited 30000 - 40000 hours between first
failtures. <br>
<br>
I have both types in the Euronaut. And a magnetic one also. <br>
The gyros are both cheap Ebay ones. One from a aircraft one from a ship. <br>
And both not working anymore. And the third magnetic one has a big error
because of the 60 ts steel below. <br>
<br>
I will by next a second hand one north stabilzed ship gyro for around 3000 USD
from a ship scrap yard electronic dealer with a confirm that they test it and
its run stable but without any further waranty. <br>
<br>
A fluxgate its a kind of electronic coils magnetic field compass and will in
most cases not work proper on a strong magnetic metal shell like a submarine
with strong electric motor fields etc. To test on your submarine if these cheap
devices runs on you submarine install a simple magnetic compass temporary on
the sensor spot in mind and than turn the submarine 360 degree. Switch on
and off all electric devices. <br>
Cross check with another compass (or the same one) far away from the sub.
<br>
<br>
In most cases an electric 12 or 24 V Dc driven Airplane direction gryro in
combination with a gps course before diving will do the job. But in 99% a ebay
100 USD item will not work proper. <br>
<br>
vbr Carsten<br>
<br>
<br>
<br>
<br>
</span></font><font color=black face=Helvetica><span style='font-family:Helvetica;
color:black'><br>
<br>
"hank pronk via Personal_Submersibles" <<a
href="mailto:personal_submersibles@psubs.org" target="_blank" shape=rect
ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
schrieb:<br>
> <br>
> There are all kinds of them on ebay for under 100 dollars, problem is how
to make it work. I assume they just have a small motor that spins. There is a
nice ship gyro sitting at 50 dollars right now but it is about <st1:metricconverter
ProductID="1 foot" w:st="on">1 foot</st1:metricconverter> dia. That would be
awesome in a big sub.<br>
> Hank --------------------------------------------<br>
> On Wed, 12/3/14, Alec Smyth via Personal_Submersibles <<a
href="mailto:personal_submersibles@psubs.org" target="_blank" shape=rect
ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:<br>
> <br>
> Subject: Re: [PSUBS-MAILIST] gyroscope compass<br>
> To: "Personal Submersibles General Discussion" <<a
href="mailto:personal_submersibles@psubs.org" target="_blank" shape=rect
ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
> Received: Wednesday, December 3, 2014, 1:48 PM<br>
> <br>
> Absolutely. You can get small ones for civil<br>
> aviation and they are used in subs. One challenge is that<br>
> most airplane ones are powered by a vacuum, but there are<br>
> 12V models. Unfortunately they're expensive, but a great<br>
> solution if you can afford it. <br>
> Alec <br>
> On Wed, Dec 3, 2014 at 1:28<br>
> PM, hank pronk via Personal_Submersibles <<a
href="mailto:personal_submersibles@psubs.org" target="_blank" shape=rect
ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
> wrote:<br>
> Hi<br>
> all,<br>
> <br>
> Ever hear of a gyroscopic compass, seems that ships used to<br>
> use them. It seems they would not be effected by a<br>
> submarine hull. What am I missing besides they are very<br>
> big.<br>
> <br>
> Hank<br>
> <br>
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