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Ship AIS Switch-Off Procedure

AIS (Automatic Identification System) should normally remain ON at all times. Switching it OFF is allowed only under specific circumstances and must follow proper procedure.

When AIS May Be Switched OFF

As per SOLAS Regulation V/19:

  • If the Master believes AIS operation compromises ship’s safety or security

    • Piracy risk area

    • Security threat

    • Naval/military instructions

  • Flag State or Company security procedures permit it

AIS Switch-Off Procedure (Step-by-Step)

  1. Master’s Decision

    • Only the Master can authorize switching OFF AIS.

  2. Risk Assessment

    • Assess navigational, security, and traffic risks.

    • Ensure radar, ARPA, ECDIS, and lookout are fully effective.

  3. Inform Bridge Team

    • All watchkeepers must be informed.

    • Extra vigilance to be maintained.

  4. Switch OFF AIS Transmission

    • AIS may be set to:

      • Silent mode (preferred, if available), or

      • Power OFF (if silent mode not available)

  5. Log Book Entry (Very Important)
    Record in Deck Log Book:

    • Date & time AIS switched OFF

    • Exact position

    • Reason for switching OFF

    • Master’s authorization

    • Time and position when AIS switched ON again

  6. Continue Enhanced Watch

    • Maintain continuous radar and visual lookout.

    • Follow COLREGs strictly.

  7. Switch AIS ON ASAP

    • AIS must be switched ON once the threat no longer exists.

What is NOT Allowed

  • Switching OFF AIS for convenience

  • Keeping AIS OFF without valid reason

  • No logbook entry

  • Officer switching OFF without Master’s permission


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