Just wait long enough. Tried it on a hike deep into a National Park between mountain ranges recently. In Airplane mode, the GPS didn't get a location. But with Airplane mode off (but no cell signal obviously), the iPhone finally got a good Location after sitting for about 5 minutes in a meadow out from under the tree cover (had to tap the blue circle on the Maps app several times). The GPS coordinate (from the Compass app) was less than 25 meters off from my friend's expensive Garmin hiker unit. The Maps app had also cached a wide-area map downloaded on the drive to the park, so when zoomed way out, it showed a blue dot over a very blurry map image of part of the park. ymmv.