You will be able to inform periodically friend or familly of you location (geolocalization) by SMS using GPS.
You can also send only alert SMS when not moving.

Very usefull when you are walking jogging trekking biking or montain biking alone and want somebody to be keept informed.
This app can alert automaticaly for you in case of fall or malaise.
You can use this location sharing app during a marathon !!!

An alarm will be played one minute before each immobility alert to allow you to prevent sending false alert (in case of long break)
You phone will vibrate when a SMS is sent.