The Coast Guard is issuing a warning to mariners and commercial fisherman about the dangers and legal consequences of disabling a vessel’s Automated Identification System. The Coast Guard has seen an alarming increase of commercial fishing and crabbing vessels disabling their AIS, purportedly in an attempt to keep their fishing spots secret from competition. The regulation (33 CFR 164.46) in part states that all self-propelled vessels, at a length of 65-feet or more, engaged in commercial service and operating on the Territorial Seas (within 12-nautical miles of shore) must maintain AIS in effective operating condition, which includes the continual operation of AIS and its associated devices (e.g., positioning system, gyro, converters, displays) at all times while the vessel is underway or at anchor, and, if moored, at least 15 minutes prior to getting underway. Violators of this regulation can expect to receive a civil penalty up to a maximum of $35,486 per violation.