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@hippy
Of course it's the screen, hippy is always right.
"I've made some measurements with my device: When running on batteries (3.0V) the eTrex consumes 70-80 mA without backlight and 100-140 mA with backlight. So a pair of batteries with true 2500 mAh should theoretically ensure about 30 hours of runtime. When running on USB (5.0V) the consumption drops to a little more than 40mA (no backlight). In both cases the consumtion rises 5-10% whith active compass. The energy required by the compass is dependent on the movement of the device: When there's no change in direction to be detected there's no consumption to recgnise. I wasn't able to recognise any influence on the consumption by the tracking-rate or during a routing-calculation. --Fröstel 14:11, 31 December 2008 (UTC)"