Navigation General · AIS
Under what circumstance should a vessel's AIS transmitter be switched off or its transmission suspended?
- AWhenever anchored in a designated anchorage
- BIn areas of heavy vessel traffic to prevent display clutter
- CWhen the master determines that continuous AIS broadcasting would compromise the vessel's security✓ Correct
- DAutomatically when vessel speed drops below 2 knots
Explanation
IMO guidelines allow the master to switch off AIS transmissions when, in professional judgment, continuous transmitting would compromise the vessel's safety or security (e.g., when transiting piracy-prone areas). Anchoring alone does not justify disabling AIS, and AIS does not have an automatic speed-based shutoff. VTS or flag-state authority may also direct suspension.
Authority: Bowditch (Pub. 9), Ch. 13
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