Prince Charles and sister Princess Anne board yacht Britannia in Portsmouth

The transcript describes a royal event where the Queen Mother and Princess are received by Admiral Sir John Edleston. Children experience excitement at the gangway, and the Duke of Cornwall interacts with the captain. The Britannia prepares to sail, with the Lord Mayor of Portsmouth welcoming the Queen Mother. The event concludes with the Britannia setting sail, marking a new experience for the royal children.

What was the significance of Britannia sailing on May 5th?

How did the little Duke seem to handle his new situation?