What is everyone using for ballistic computers on the hunt (PDAs)? I have an old Palm with a Horus Vision chip that I really like the software. The problem I am having with the Palm is there is not a back up/hold up battery in the device, so if the AAAs run dead due to the cold or whatever, I lose all my ballistic data. This is not good when you are trying to make a shot on a critter at great range (trust me - I lived that nightmare). I always keep a range card in my stock pack, however the Ballistic PDA is very nice to have to get the finite data using the existing environmentals.
So the real question is, what is everyone using for PDAs and what PDA has a hold up battery so I don't keep experiencing this problem.