"Only the end that matters?" I don't think so. Check points have closing times for good reason. If the timers had to deal with 170 different start times it would be a nightmare and if communications were to break down (ie radio and cell phone) it would be even worse. Timing at a "regular" ride (And I've never seen one where all riders cross the start line at once, nor would I want to be involved in that chaos) is a big enough problem.
Marsh the muleman
--- On Tue, 8/11/09, Sisu West Ranch <ranch@xxxxxxxxxxx> wrote:
"...to be some fancy math going on all day to figure out what place each horse was in, and by how much..."