One last comment on this for now. What affect would this have over a 1 second time period. Look no further than the z168-186 frame span. 18frames converted to 18.3 frames = 1 second is 18.3/18 = 1.01666...  multiplier 21.6ft distance (z168-186) x 1.01666 multiplier = 21.96ft per sec/1.47 = 14.94mph Now subtract the bogus 3.74mph span of z168-z171 from the overall speed of 14.94mph 14.94 - 3.74 = 11.2mph Who was responsible for the z168-z171 bogus entry? Mr. SHA