Lyman; I've not met Bob Thurston, but I use the method you attribute to him. For courses measured in segments, I use the sum of the shortest segments. In all cases, after the 2nd cal ride, I return to the course for final adjustments and marking, even if this happens on another day. The sum of the shortest segment method usually requires a separate ride of the entire course for establishing the intermediate (mile) splits. I send a measurement data form for each segment, plus a measurement data form with a summary of the segments totaling to the distance of the course. It may seem like extra work, but I've used those measurement data sheets several times when courses had to be recertified because of changes.