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It is the altitude of the solo sitting on the ground when you arm for takeoff. That will be zero. If you climb above the takeoff point, it will be a positive altitude. If you descend into a valley below your takeoff point, it will be negative.
sry, but i have to disagree, controller doesn´t show negative altitude it stays at zero if you go below your starting altitude
tried this 2 weeks ago in the alps, starting at 3000m and was also surprised that it didn´t show me this info