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Information on Measuring Speed of Descent While Skydiving With an Outdoor GPS
Outdoor devices that have a barometric altimeter are capable of providing vertical speed.
Refer to your owner's manual for instructions on setting a Vertical Speed data field or on utilizing the Jumpmaster1 page, which was designed for skydivers.
Utilizing these features on the device will allow for maximum use of the device while skydiving. As always, the GPS is a guide, not as the absolute definition of what is happening.
1 Not supported on all devices; refer to your owner's manual or see the Related Content below.