This App provides useful information for practicing sport activity. This App is iPhone independent. You need only your iWatch

Information provided:
-Speed Max -Current speed
-Distance -Average Speed
-Rising -Altitude difference
-Altitude Start -Altitude End
-Elapsed time

On the first page, the battery level is visible.The App uses the GPS. The battery level decreases of nearly 5% per hour when the App is started. To avoid a low level battery, the GPS collection is stopped as soon the battery level is below 25%. The battery symbol color change when the battery level is below 50% and 30%.
 
It is possible to switch between metric and imperial unit system

Usage example
Biking : sprint speed
Skiing : down hill speed