AIS Advisory

The Coast Guard has noticed that many Automatic Identification System (AIS) users are not updating their unit to accurately reflect voyage related information—navigation status, static draft, destination, ETA, etc. Further, the Coast Guard has encountered AIS units that either do not transmit at all or improperly transmit the vessel’s dynamic data—position, course, speed, heading, etc. The former problem requires due diligence on behalf of the user, the latter is most likely due to the improper installation or operation of external sensors—gyro or heading device and vessel GPS system—inputted into the AIS. AIS users are compelled to properly operate their AIS at all times (33 CFR § 164.46). They should pay close attention to these matters, and are encouraged to make each other aware of AIS discrepancies they come upon. Improper operation of AIS could subject the user to civil penalties not to exceed $25,000.

Note, AIS data can be invaluable, however, as with any source of navigation information; it should not be solely relied upon in making navigational and collision-avoidance decisions. Further, while AIS allows for safety related ship-to-ship text messaging to communicate with others and make passing arrangements, these communications do not meet the requirements of the Vessel Bridge-to-Bridge Radiotelephone Act (33 U.S.C. 1201 et. seq.) for broadcasts on the designated bridge-to-bridge channel, nor do they relieve a vessel operator from the Navigation Rules requirement to sound whistle signals or display signals.

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