What is the maximum length of vessels that are excused from lights and whistle signals when anchored in special anchorage areas?

The correct response indicates that vessels up to 20 meters in length are exempt from displaying navigational lights and sound signals while anchored in designated special anchorage areas. This regulation is established in the Navigation Rules and provides flexibility and reduced requirements for smaller vessels in these specific locations, recognizing that smaller boats generally pose less risk of collision or navigation issues due to their size.

Vessels larger than this size must still adhere to the standard lighting and signaling requirements, which are crucial in maintaining safety and preventing accidents in more congested waters. Understanding these regulations helps mariners to comply with the rules while also utilizing safe havens like special anchorage areas appropriately. This provision acknowledges that fewer requirements for smaller vessels can contribute to reduced complexity in areas specifically designated for safe anchoring.