If you look at Sark it is effectively 2 islands joined by a narrow causeway. With the wind in the west go to the east side of the causeway and vice versa. Dixcart and Derrible are adjacent bays on the east coast just above the causeway sheltered from the predominant S-Westerlies. It's a great stopping off point before going to Jersey and if you are late on the tide going south its a good place to wait out the north going tide before continuing to either Jersey or St Malo.