2.2 Each Area Elimination is open to all single or multi-crew catamarans under 22 feet in length with a current US SAILING Portsmouth number. Boats with Provisional Portsmouth handicaps (e.g., those with brackets [ ] or parentheses ( ) around their rating), are ineligible to compete in Area Eliminations. Only boats in their original One-Design configuration are eligible. Modifications requiring Portsmouth "modification factors" are not allowed.

What happens if a uni-sailor wins? What does he do for crew in the Alter Cup?

http://www.seacats.org/boats%20pre-reg.htm