How do I preserve the battery life of my iPhone?
GPS requires a significant amount of battery power, enough to exhaust the iPhone after a four or five hour round if left on the entire time. We expect that improvements will be made in the iPhone itself over time, but in the meantime, there are practical ways to deal with this. What I do is shut the phone off when I don’t think I’ll need yardage for awhile, then turn it on again 20 or 30 seconds before I think I’ll need it. For example, after you hit your approach shot into the green you probably don’t need another yardage until the next tee.
