ORIGINAL: OLD_SLOW and in the WAY
layout 88 ft between a couple markers, have your buddy stand back and time the run with a stop watch. if you travel the 88 ft in one second, your doing 60 mph.
or a shorter course is... 44 ft then its 1/2 sec per 60mph
i tie wrapped my garmin Etrex to the cage
you can buy an Etrex super cheap on e-pay for around 60 buck now