Downhill App Professional

The Downhill App Professional, running on several Connect IQ™-compatible Garmin devices, shows you key parameters like speed, heart rate, altitude, distance, etc. with high sensitivity GPS. As special feature an automatic phase detection is implemented in order to provide you separate values when going up by lift or when driving downhill. Additionally an ANT+™ compatible sensors for heart rate and temperature monitoring are supported. It is designed as a watch app (and not a data field) for following reasons:

Simple to install and use
Arbitrary feature enhancement possible
Circumvent that some watches (e.g. vivoactive™) can only display two Connect IQ™ data fields

Link to Downhill App Professional on Garmin App Store

This website provides further information regarding requirements, installation, getting started, supported data fields and features as well as frequently asked questions.