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Nope, I don't use Latitude at all.
I am thinking that it is glitchy reporting.
Well, if I turn off GPS it stops counting the GPS used in the battery meter.
However, again 17 minutes of GPS use (I did use it for 17 minutes)...
Last night I used my phone for a total of 16 hours before recharging it, maps was showing up as using 24% of the battery with about 17...