• Earthloop used http://greenalp.com/RealTimeTracker/­ on an android phone on the spiral ride with no complaints.

    Yes, but that phone had an extra-large battery. I'm still using the greenalp tracker, and I have it set on the most battery-hungry mode (frequent updates) and it uses about 25% of battery per hour on my fairly typical phone. You can set it to be much more conservative.

    Last time I looked there was no iphone version though

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