[Therion] Magnetic deviation corrections

[Graham Mullan]

Therion appears to correct for mag deviation automatically, based on the 
date that a survey was carried out. is it possible to turn this feature 
off within specific surveys? I have much legacy data where either the 
relevant correction has already been applied or where they have recorded 
a "compass correction" which includes both instrument error and mag 
deviation in one figure.

Graham
--
graham.mullan at coly.org.uk

0117 9502556 or 07887 637064 (or 0844 2327803)