http://www.faa.gov/about/office_org/...rpretation.pdf

Additionally, where the question of definition of "original point of departure" arises, the most recent interpretive statement between MacPherson and Keller notes that there is no definition given for "original point of departure." The definition will be subjective to the classification in the logbook, and to an individual-case review.

http://www.faa.gov/about/office_org/...rpretation.pdf