The element of our occasional discussion about measuring unpaved sections of courses that tends to vex me is the anecdotal evidence that measuring on grass with a cal constant derived from a certified cal course on pavement tends to have a lengthening effect on the off-pavement part. That is, for instance, a 300 meter section measured on grass - as compared to a 300 meter paved section, - both using the same cal constant, tends to require fewer counts than on pavement, as verified by a subsequent steel tape check. It seems to me that there may be sufficient reason to investigate further. If measuring on grass reliably lengthens a course measurement and never shortens it, so to speak, might this auger well for off-road certifications?