> 18. 2. 2017 v 9:20, Benedikt Hallinger via Therion <therion@speleo.sk>:
> 
> Based on what you have said, i would assume that the problem source lies in 
> therion itself summarizing all centreline dates into one survey average date, 
> and not just by centerline as i would assume, when each centerline has a date 
> specification.
> 
> The main issue here is, that we have surveys which were taken in the 1950s 
> and extended with an additional centerline in 2000s.

date and date - each survey has calculated its own declination according the 
date it was surveyed. 

The position of point for which the declination is calculated is averaged.

m.s.
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