And in-case you run into an odd distance imperial cal course:
Calibrate on any IMPERIAL course using this formula:
(5280 / cal course length in Ft * Avg counts) * 1.001
(5280 / 1000 * 3434) * 1.001 = 18149.6515 ct/mi
Convert imperial constant to metric
( 18149.6515 / 1.609344 = 11277.6706 ct/km )