Just a spray rail. Look where it fairs back into the hull. The Mk1 hawk had a problem with the spray from this area flowing over the rounded deck and hitting the main beam making the leeward hull a very wet area for the crew.
Cheshirecatman
Aren't they all wet there? Man, I was foredeck on myown boat at Sakonnet 100, for 10 miles downwind with Spi, and skip wanted to sail deep, so I was on the leward hull. It's wet down there. Needed scuba equipment!