Spike, just pm'd you.
When I calibrated my Koso, I just divided the tyre circumference by 4 - giving about 487 and then just Input the number of pick up points. In my case 4.
IVA man was happy.
Bare in mind it cannot be accurate, it as to over read but within a percentage of any given speed. Ie if ur doin 70 (?), them more likely you'll be doin about 66, hopefully made that clear
