Add a find lost sensor mode.

Since the sensors are connected to Bluetooth and have gps.

On losing sensor on hill with sensors active:
1) dig popup to ask if user to track back to last known location. (Potentially audio prompt headphones are connected)
2) overlay last run with sensor info with zoomable map of ski resort. Below map have an arrow and direction indicator and distance.
3) once in Bluetooth range use the sensor data to pinpoint lost sensor. (Incase other people skiing moved the sensor and quicker finding)

If not recording at time (off slope):
1) same as 1) above but on sensors status page.
2) same as 3) above. Not sure if can get direction if building blocking gps but maybe Bluetooth signal strength could be used.

Finally if the sensor still can’t be found the ability to just replace the missing sensor instead of having to buy both would be nice.