I am going on a long (80 miles) hike in a couple of weeks and don't expect to receive my watch until next week. The hike will take approximately 4-1/2 days and I know that i'll REALLY want to wear my new watch but am wondering if its worth it. I'll have a battery pack so I can use and recharge my 6 plus for GPS. I won't have time to test the battery and apps extensively before I ship out so I am asking you guys that have owned yours for a little while. If my phone stays on airplane mode most of the time, do you think it's even worth worrying about the extra juice I would have to carry to wear it on the trail?