Since the Firmware update to 4.0 there is a datafield called "vertical speed". But the field only shows values between 0 to 0.2. I don't know what this numbers should describe because the datafield *BigFont Mountaineering" shows different hm per h. So i have no idea what this numbers could be. Also aren't there any information in garmin connect for example a graph with the vertical speed information like the heart rate. I hoped it would be fixed with 4.4 but it's still the same.
Hopefully they fix it in the next update!