I recently bought a LHT and I'm gearing up to do more touring (I've only done a couple of over-nighters so far).

Anyway, I've been biking for fitness regularly for the last year or so, and I've been using a wireless Bontrager mileage computer. It's been somewhat erratic and recently quit working altogether, so I'm looking to replace it.

The thing is, I've also been considering the usefullness of some kind of GPS unit, or an equivalent set up on an iphone or android mobile device.

My question is this: Can I take care of mileage tracking, average speed, etc.. AND my navigation on one device? In other words, if I buy an android, or a nice GPS in a month or two will it make a new mileage computer redundant?