Note
Just received a long email from the race director for the Cayuga Trails 50. In the middle of the email is this small note:
"For those of you following our occasional Facebook updates you're aware that course run-through's with different mapping programs (Garmin and NASA based numbers) have yielded an increase in the elevation profile of the course. My mapping software (National Geographic Topo has time and again shown an elevation gain of about 6,500 ft (with corresponding loss). The (most likely more accurate) Garmin/NASA figures are putting it closer to 10,000 feet."
Surprise.