Skydemon question on vertical profile
I have searched the Skydemon website but cannot find an answer to this one.
Am interested to know how Skydemon computes clearance from the base of controlled airspace. Presumable the aircraft vertical distance from the ground is GPS derived given known position and elevation of the ground at that position. But how is the base of controlled airspace derived on the pictorial?
As there appears to be no correction for pressure and/or temperature this would surely mean the base of controlled airspace is in error?
More and more people are relying on these devices these days but assuming position is known the only arbiter with respect to being vertically clear of controlled airspace is the indicated altitude on the altimeter assuming the subscale is correctly set?
By the way I am not a Luddite when it comes to using Skydemon (although I think all pilots should be trained and practised in visual navigation without using GPS).
Thanks for any help.