In most jurisdictions you are guilty if one of the crew steps off the boat onto the marina dock before you have direct permission from C&I.

"Vessels entering the BVI should proceed directly to a port of entry. Because space at the jetties is limited, vessels are allowed to anchor in the harbour before making their Customs entry. You may not proceed to a marina until you have cleared your yacht unless you are using a Ships Agent. If you arrive after hours, you must raise your yellow flag and no persons may go ashore. You may seek permission in advance from Customs and Immigration for a late arrival by calling one of the ports of entry.
Marina operators should ensure that vessels tied up at their marinas have been duly entered at Customs and Immigration."