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<DIV>The calibrations were to grid north not true north</DIV>
<DIV>The little file help illustrate the problem. Either declination statement
can be used (or both, as they don’t stack).</DIV>
<DIV>If the cs command is commented out, we get a level square, but a rotated
square if the cs command is used. </DIV>
<DIV>So that was the solution, the difference between grid and true north.</DIV>
<DIV> </DIV>
<DIV>I then used the north true command and this rotated it to be level, north
grid then moved it back. So back to north true.</DIV>
<DIV>I am now unable to reproduce the the twisted again. I seem to be locked
into this north command. </DIV>
<DIV>Even when the declinations are commented out, I cant get it to use the cs
declinations. Whoops!</DIV>
<DIV>(yep I did restart the computer with no joy)</DIV>
<DIV> </DIV>
<DIV>John</DIV>
<DIV> </DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=lists@group-s.sk
href="mailto:lists@group-s.sk">Stacho Mudrak</A> </DIV>
<DIV><B>Sent:</B> Wednesday, October 03, 2012 2:04 PM</DIV>
<DIV><B>To:</B> <A title=therion@speleo.sk href="mailto:therion@speleo.sk">List
for Therion users</A> </DIV>
<DIV><B>Subject:</B> Re: [Therion] Declination and the cs
command</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">If
declination is explicitly specified for centerline, automatic declination is
turned off.
<DIV> </DIV>
<DIV>The reason, why you have a rotated map is probably "meridian convergence".
I am not an expert in this topic, but coordinate system north is usually also
rotated against true astronomical north.</DIV>
<DIV> </DIV>
<DIV>Have you played with layout north settings? E.g. include:</DIV>
<DIV> </DIV>
<DIV>north grid</DIV>
<DIV> </DIV>
<DIV>in the layout? Are you able to measure somehow this artificial rotation?
Therion in its output reports both - calculated magnetic declination and
meridian convergence for cave area.</DIV>
<DIV> </DIV>
<DIV>Another question? Do you measure declination against true (astronomical) or
grid north?</DIV>
<DIV> </DIV>
<DIV>S.</DIV>
<DIV> </DIV>
<DIV>
<DIV class=gmail_quote>On 3 October 2012 13:54, John Stevens <SPAN
dir=ltr><<A href="mailto:john@k-stevens.co.uk"
target=_blank>john@k-stevens.co.uk</A>></SPAN> wrote:<BR>
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class=gmail_quote>
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<DIV>It seems the cs command over writes any declination that has been set,
using the date provided with the survey data.</DIV>
<DIV> </DIV>
<DIV>I have a large batch of old data with some accurate local declinations
given. Unfortunately these are overridden so I can’t compare my results with
the original results.</DIV>
<DIV>How can I make sure my local declinations are used rather than the cs
global declination.</DIV>
<DIV> </DIV>
<DIV>Another problem on the same line. I have a set of data where the
declination has been taken off the bearings, so the local declination is now 0
degrees but the cs command still adds a declination, moving it way out from
its expected line.</DIV>
<DIV> </DIV>
<DIV>Can we have therion having a priority for local declinations rather than
the gobal cs delinations ?</DIV><SPAN class=HOEnZb><FONT color=#888888>
<DIV> </DIV>
<DIV>John</DIV>
<DIV> </DIV></FONT></SPAN></DIV></DIV></DIV><BR>_______________________________________________<BR>Therion
mailing list<BR><A href="mailto:Therion@speleo.sk">Therion@speleo.sk</A><BR><A
href="http://mailman.speleo.sk/mailman/listinfo/therion"
target=_blank>http://mailman.speleo.sk/mailman/listinfo/therion</A><BR><BR></BLOCKQUOTE></DIV>
<DIV> </DIV></DIV>
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