You can connect it to a PDA (if you have one) and there's loads of software available to make it do woderfull things. (have a look at the Flight Buddy for the Pilot)I have the Summit version with a pretty good altimeter function (separate peizo sensor), so handy for the back seat to give them height direction and ground speed.
But it is after all another reason not to get your head out of the cockpit.
Merry Christmas
CC