Enrolled yesterday.
You get a card with an id #.
Required to submit a floatplan with CBP online within 24 hrs of departure.
Must closeout floatplan online upon arrival at foreign port.
Have to post a return floatplan within 24 hrs of return departure, call in on arrival and closeout the return floatplan online after checking in by phone.
Royal PITA! Wish I knew these details before enrolling.