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Declination Diagram (Arrow) Tool

Question asked by Hydronaut on May 29, 2015
Latest reply on Jun 16, 2015 by sephefox

Hi all,

 

I have downloaded the Declination Diagram toolbox for ArcGIS 10.2 and am having some difficulties with it's execution.

 

I follow the instructions provided and have copied the elements into my map.

 

When running the tool in my projected map (UTM z XX), it does calculate True North and a centroid for my map, however the tool calculates the Magnetic Declination Angle in Decimal Degrees as 'None', and hence it spits out the following:

 

Magnetic Declination Angle in Decimal Degrees = None

Annual Drift = None

Magnetic Declination Direction = W

Exception : int() argument must be a string or a number, not 'NoneType'

 

The tool fails to execute.

 

Can anybody offer any suggestions as to why the tool is calculating the magnetic declination angle as None?

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