I own a garmin etrex vista hcx - quite an old unit now - probably over 10 years old design. Its good for tracklogging and its ok for navigating.
However, I recently installed Strava on my phone and its clear that the iPhone 5 can do track logs. Battery life is not a problem because I've got a back up solar charger and neither is durability as I have a rugged case for the phone.
My question is, is there any need for both items? If I can avoid using my GPS unit then that means I also don't need to take AA batteries, spares, or an AA battery charger.
Lastly any good GPS mapping / track logging apps for iPhone for general hiking (in Spain / Georgia).