Want a bit more concern? Look at my flight from May 13.
http://www.onlinecontest.org/olc-2.0...l?dsId=2355098
Good baseline before takeoff, but it is 400+ meters high. Then, a bit
into the flight, there is a downward vertical correction (19:09:08).
Maybe again the 2D to 3D correction? Then, right after the downward
correction, is a majoor upward correction (19:11:16. There were no 18
knot thermals or even short climbs due to a zoom). Could be that the
inflight corrections were when I move the logger from the panel to the
canopy frame.

Interesting that I have not ever seen any major jumps like that with
the GPS altitude from my Cambridge logger.

Steve Leonard