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>>Can
anyone suggest a good iPhone app which might supplement paper maps on a
thru hike? Is there any app which might be used instead of a separate
GPS unit? Thanks!<br><br><br>Gaia GPS is *the* GPS app for iPhone. MyTopo and satellite map coverage for the entire US, cache-able from the cloud as needed. Transferring GPX tracks and points by email is a breeze. The iPhone 4's GPS works at least as well as my old Garmin eTrex, and probably better. Battery life is a big concern with GPS apps, though, so you'll either need to use it very sparingly between town chargings, or carry one of these:<br><br><a href="http://www.suntactics.com/USBSolarChargerMoreDetails.html">http://www.suntactics.com/USBSolarChargerMoreDetails.html</a><br><br>- blisterfree<br><br><br></td></tr></table>