[Therion] Multiple fixes for the same point

[Martin Sluka]

Check that application features and check it in real situations. You’ll be surprised, I’m sure.

m.s.

> 12. 9. 2017 v 8:28, Philippe Vernant via Therion <therion at speleo.sk>:
> 
> The problem, is that you cannot do a calibration fo a GPS since it will depend on the satellite constellation which change all day long even if you don’t move. So calibration of a GPS is a no no!
> If you use accurate GPS measurements, either baseline measurement, of PPP post processing (but you need a GPS slightly more expensive that the regular handheld ;-) ) you can have an accuracy of a few millimetres. So the std-dev should always be given explicitly for GPS.