Paragraph 17

No vessel compelled or allowed to anchor in or near the main fairways, any other fairway or approaches to the controlled area, shall be left at any time without a shipkeeper.

For the purposes of sub-paragraph (1) above, a vessel is anchored near the main fairways, any other fairway or approaches to the controlled area if she could, at the extent of her swing, and having regard to prevailing or anticipated weather conditions, and the potential to drag her anchor, infringe on the fairway or approaches to the controlled area, as the case may be.