[Therion] Declination handling imprecise?

[Martin Sluka]

> 18. 2. 2017 v 9:20, Benedikt Hallinger via Therion <therion at 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.