- in the helicopter the ipad bounces around (but I presume that's valid in smaller fixed wing as well) when the orientation of the screen is flipping between portrait and landscape (I now know to lock this by changing the settings to use the mute button as a screen lock) but the problem is that on several occasions the track disappeared off screen as if it was still scaled to the other orientation where the big yellow arrow points down and the aircraft icon is off the page. I waited a while but when I couldn't wait any longer I had to manually drag the screen to put the aircraft icon in the middle of the screen.

"Alerts are triggered by approaching airspace, not aerodromes. You should get one when approaching the London/Heathrow CTR"

I understand that the an alert is triggered by airspace but the two issues with that are;