[Therion] Declination and the cs command

[Stacho Mudrak]

If declination is explicitly specified for centerline, automatic
declination is turned off.

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.

Have you played with layout north settings? E.g. include:

north grid

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.

Another question? Do you measure declination against true (astronomical) or
grid north?

S.

On 3 October 2012 13:54, John Stevens <john at k-stevens.co.uk> wrote:

>   It seems the cs command over writes any declination that has been set,
> using the date provided with the survey data.
>
> 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.
> How can I make sure my local declinations are used rather than the cs
> global declination.
>
> 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.
>
> Can we have therion having a priority for local declinations rather than
> the gobal cs delinations ?
>
> John
>
>
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