Seeing as the iPhone has an incredibly short battery life when in GPS mode and the battery can't be swapped for a spare how were you chaps thinking of charging the phone up whilst in flight? I only ask because I've recently binned my iPhone for an alterative due to its pathetic battery life and the inability to charge it whilst out and about in the middle of the countryside. I'm no expert on cockpit layouts but I can't imagine there is a cigarette lighter socket to put a charger into!