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I can't tell you whether this will change your battery life or not. I've operated it this way since day one. What I can tell you is that with light to moderate use, I'll still have about 30% battery left when I go to bed.
The 1st time I fired up the GPS I got a lock in under 60 seconds, but the accuracy was only about 30 yards. Ever since then, it locks on in about 5 seconds and settles down with an accuracy of 2 yards. I use "My Tracks" do log walks and bike rides. The accuracy is good enough to tell what side of the street I'm on, or whether I'm on a sidewalk or not.
Yesterday, I disabled the GPS toggle because I was going flying... and flight mode didn't disable it. When I turned it back on this morning to go for a bike ride, it did take about 5 minutes before "My Tracks" started recording my trail. That caught me by surprise... its the 1st time I've ever had any significant delay.
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