With your GPS device, record your GPS position track to a GPX/Kml/Nmea file
Go to submit page by clicking on:
Submit a track
Choose the file containing your track:
Choose an activity:
Submit your track:
Get a view of your track, and:
If you selected a wind-related activity, you will get directional figures such as VMG, polar, ...
Do not forget to check the wind direction detected by the software. It can be changed if it is wrong or in case of changing wind
If you selected a ground or air activity, you will get vertical figures such as vertical speed, ...