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Have you considered a hand-held device like a Garmin Oregon 550? I use mine as a satnav and I'm sure if you activate tracking it would record the number of kms travelled. It may also be useful for the type of work you do. You can download and record waypoints and the device will guide you to them even if they are off-road (not sure if all satnavs will do this). You can download these to your computer and project them onto Google Earth. It will take reasonable quality, geolocated images and even has an alarm clock! Indispensable when in the field.
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