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Changing magnetic north late in planning cycle

Posted by Peter Gorvett 
Changing magnetic north late in planning cycle
January 07, 2019 12:29AM

We are less than two weeks from our event and I realised that the revised map was still magnetic north 2014. Our mapping expert has provided a new map rotated to magnetic north 2018. It is georeferenced and the georeferencing is fine in the new version, but the Condes controls don't match.

I saw the forum post about changing coordinates [] and can see I can't fix it, but can you suggest how we can redo this change so that Condes maintains the same OCAD coordinates for the controls after the change?

At the moment I can think the only option that doesn’t involve trying to adjust every control manually or via a complex process is to ask for the map to be rotated back and have the magnetic north lines correct for 2018/9, but not parallel to the edges of the map.

Finn Arildsen
Re: Changing magnetic north late in planning cycle
January 07, 2019 12:38AM
I am afraid there is no nice solution to this issue. Currently, control site coordinates are stored as “paper coordinates”, and in this case the paper coordinates change when a new, rotated OCAD map is used.

Re: Changing magnetic north late in planning cycle
January 08, 2019 06:12PM

Thanks for your prompt response. Must make sure it gets done earlier next time.


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