LiveRun (by LiveTrail®) : App for the runners.
The equivalent of a personal pacer on your smartphone
The LiveRun app (by LiveTrail®) is by now the reference interface for security.
In the case of SOS, it will send, via text message, your GPS position to the organisation.
You will get helped a lot faster! Beware, you will need however to call the race HQ (PC Course) (Emergency N° +33 4 50 53 47 51)
Bring with you an external battery so that you can use LiveRun throughout the race.