The 2nd video is from a sport camera mounted to the stern of the boat as it sails across a large pond. At first, it don't look like the boat is moving. But at 1:07, 2:12 and 2:30, you can see small debris on the water go swiftly past the starboard (right) side of the boat. At the end of the journey across the pond, you can see how quickly the boat approaches land.