GPS tracking
Starting with my Mt. Cabot hike (#39 of the 48), I've been recording my journeys with an app on my phone. I found that running the app didn't use much power, and it was nice to have the recording. For the most part I've used the OSMand app, but for the Mt. Pemigewasset hike I switched to Gaia. I thought it might have better info about one of the trails I'd be using, and I just wanted to see how it worked. On my last hike , I noted major differences between what Gaia recorded and the info for the route in the AMC White Mountain Guide. The AMC Guide said it was an 8.7 mile route with 2850 feet of climbing, but Gaia recorded 8.06 miles and 2678 feet of elevation, quite a significant difference. What was going on? Gaia (and all of these apps) saves the recording in a standard file format known as GPX (GPS eXchange). The recording is a "breadcrumb" track, with the app noting the GPS info (lat, lon, altitude) at regular intervals. The GPX files can be shared (expo...