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What Information is the Vertical Speed Data Field Displaying During an Activity?
Vertical Speed is a measurement of the upward or downward movement of a device over time, measured by feet or meters per minute.1 The Vertical Speed is typically used to determine the time to the peak or base of a climb.
1 Feet or Meters per minute depends on the "units of measure" setting on the device. Refer to your owner's manual for more details.