***
Special Notice: *** Please be advised that our mailing
address has changed and is now: U.S. Coast Guard Navigation
Center, NAVCEN MS 7310, 7323 Telegraph Road, Alexandria, VA 20598
- 7310. Mail sent to our previous address will not be delivered. Please
contact us with concerns
or questions. Our physical location remains the same. Thank you for
your attention to this matter.
For the exact text concerning arcs of visibility, please see
Rule 21. This guide is intended to give a graphical representation
of Rule 21 (with the exception of an all-round light and flashing
light).
