Penguina has been playing with her lovely new GPS that she got bought for her birthday and has started programming in waypoints with the level that the Class A starts as their 'elevation (AMSL)' - she hasn't tried it out yet, but suspects that if she's bang on or above the 'right' elevation it will be time for her to turn off the Penguina Mode C and push the Penguin beak downwards.
I'll ask her to report if it works when she's actually flown with this wonderful gadget.