The map does require a certain degree of data exchange between your phone, cell towers, and satellites, so that's always going to be a bit of complication. The rest I can easily deal with.

[But he smiles as Balthier talks and holds out his phone. David doesn't even take the thing in hand, he merely touches it briefly before gesturing for Balthier to put it away.]

I promise we'll see each other soon if I can arrange it. I might actually need to borrow you for something if you don't decide in the next few hours that you regret this whole conversation. If you do, text me and tell me to leave you alone. My phone number is already in there, I took the liberty of favoriting myself in your contacts and putting me in speed dial as number seven. Now get moving. I can do the rest of the work on your phone while you're walking. I'm interfaced with your phone right now, and I'll 'lock' it on the way out.