Jo - the Distance Markers option is only available when the Common Start Times box is unticked. Seems to me it's only appropriate when the Common Start Times box is ticked. As it stands, with CST unticked and DM ticked, Kurt appears to have done approx 1800 miles between 1st & 9th Jan, but he didn't start until 10th. So his cum distance is always overstated by ~1800 miles, based on where his line intersects the distance markers.