I find instant vertical speed, where is 30sec vertical speed?
The instant moves too much, the 30sec is more accurate, for bike and hike uphill too.
In 920 I used it every day...can GARMIN insert it in the next software update?
TBH not quite sure what that actually does but sounds useful if you are interested in vertical speed.
It makes your watch measure speed and distance taking both elevation change and horizontal movement into account. Normally your speed and distance are calculated as if your elevation isn't changing at all, which is fine for running and cycling, but maybe not for sports like skiing.
As an extreme example, if you ran 1k on (consistent) 45 degree incline, your "2d" (or horizontal) distance would only be .7k, but your 3d distance would be 1k. Your 2d pace wouldn't reflect how much ground you were really covering.
Similarly, if you climbed up a completely vertical cliff face, your 2d distance would be 0 no matter how much you climbed. 3d distance would take your ascent into account.
However, I believe 3D speed/distance would only apply to the standard distance, pace and speed fields, since they are normally calculated only taking horizontal movement into account. I'm guessing vertical speed would probably be calculated the same way regardless of the 3d settings, since it's already a dedicated metric for vertical movement.
This data field calculates a smoothed climbing rate and displays it in ft/min. On my Forerunner 920XT unit, the 30s Vertical Speed field seemed to bounce around wildly with each reading; so I wrote this to calculate a smoothed (10-second average) climbing rate.
