People pick Cairn for their family's peace of mind: auto-alerts with your last coordinates if you are overdue, and the cell-coverage map are genuinely valued by solo hikers. The weak spot is the core thing itself: tracking sometimes silently stops mid-hike and it crashes offline, and the trail you need is sometimes just missing from the database.
評価点：Auto-alerts to family with coordinates, cell-coverage map, peace of mind for family, offline maps ahead of time, route and elevation-gain tracking
不満点：Tracking stops on its own mid-hike, crashes in offline mode, needed trail missing from database, rigid list of return times instead of your own
向いている人：Solo hikers and their loved ones who need family to know the route and last location