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Auto-Rotate Map Eats Battery

My desire is to used the RWGPS iPhone app as a navigation device for long rides (brevets) rather than having a separate GPS.  Obviously battery life is a big limiting factor.  I like to have the screen on so I can verify I am on-route, even though that results in a shorter battery life.  On a recent 300K I noticed that my external battery drained much more quickly than I expected after testing it on a previous ride.  Later I realized that I had enabled the "Auto-Rotate Map" setting.

My tip is to leave this setting off to extend battery life.  I like having the map oriented to my direction of travel, but I am guessing that this feature uses the magnetic compass.  Smartphone compass hardware uses a surprising amount of power.

 

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