USPA National Speed Skydiving Championships Competition Rules:
Speed Performance Record – Individual – Speed Flying
Maximum vertical speed
(1) The record performance of a speed jump is one of the following:(a) The maximum vertical speed attained, measured in km/h, without a drogue during the time from exit to the altitude at which the fall is terminated as measured by the required equipment, as per paragraph (2) below.
(b) The maximum vertical speed attained, measured in km/h, with a drogue during the time from exit to the altitude at which the fall is terminated as measured by the required equipment, as per paragraph (2) below.
(2) The vertical speed in freefall or in drogue fall is to be determined using an appropriate flight recorder, calibrated barograph or other reliable and appropriate method. The record file submitted must contain:
(a) Calibration data to substantiate the accuracy of the data submitted, including the margin of error.
(b) Evidence that the data cannot be and has not been tampered with between the time it is recorded and the time it is handed over to an Official Observer.
(c) Evidence that the instrument registers and provides the type and accuracy of data required to determine the record performance.
(3) A new vertical speed jump record is set only if the lower limit of the error range of the record performance is greater than the upper limit of the current record error range by at least 2%.
Exit means the point in time at which the individual leaves or jettisons the device in or by which he is being carried.
No means of propulsion may be used after leaving or jettisoning the device by which the individual has been carried to the exit point.
(4) The performance shall, if possible, be determined with an overall margin of error of +/- 1%.
If the overall margin of error in the determination of the performance is no more than +/- 1%,the value of the record shall be equal to the figure determined rounded down to the nearest whole number together with the margin of error.
If the overall margin of error in the determination of the performance is greater than +/- 1%,the value of the record shall be equal to the lower limit of the actual error range, rounded down to a whole number.