Altitude lower than 0 (MSL) is not saved properly
Hey! Over here, in Israel, we're able to fly under altitude 0. This is not dealt correctly as can be seen in the photo / log from 20.7.18
https://www.xcontest.org/world/en/flights/detail:lshachar/20.7.2018/06:37
In the past (12.8.2017) xctrack used to deal with this correctly:
but xcontest didn't: https://www.xcontest.org/2017/world/en/flights/detail:lshachar/12.8.2017/08:45