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.
Points forts : Auto-alerts to family with coordinates, cell-coverage map, peace of mind for family, offline maps ahead of time, route and elevation-gain tracking
Reproches : 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
Pour qui : Solo hikers and their loved ones who need family to know the route and last location