We hadn't been killed and using the keychain is not mentioned on the metagaming section. I get Jonatan Hoax's point though but I suppose you could roleplay it in as having a tracker installed on the truck.
Using the keychain could be RPed that the vehicle is equipped with a GPS and in ArmA3 its year 2035 so I would think there would be a tracking system in vehicles.
I wasn't doing the landing as it was my friend landing henceforth why I was yelling 'HARD RIGHT'
Yesterday we actually discussed his flying with a couple more friends... apro said 'I'm good at flying' but another friend named several other times when apro crashed other choppers