August 29, 2010
USCG issues safety alert to AIS users
Some AIS users may not see -- or be seen-- by other AIS users. The users that may be effected are those navigating the James River, York River, Upper Chesapeake Bay, Delaware Bay, New Jersey Shore, and New York Harbor and approaches
The Coast Guard has put out a Marine Safety Alert that says that between July 27 and August, 2010, while conducting development testing of its Nationwide Automatic Identification System (NAIS), the agency inadvertently tele-commanded most AIS users transiting the Eastern United States between lower Connecticut and North Carolina to switch to AIS frequencies other than the AIS default frequencies (161.975 MHz - Channel 87B - 2087 and 162.025 MHz - Channel 88B - 2088). As a result, those users within certain uniquely defined channel management regions will neither see nor be seen by vessels operating on the default AIS channels when within these regions. Similarly, vessels operating on default frequencies will not see or be seen by those vessels that were inadvertently switched to other frequencies..
Read the complete Safety Alert HERE