What are the statutory requirements concerning on-board operation of AIS?

Paragraph 21 of IMO Guidelines for the Onboard Operational Use of Shipborne Automatic Identification Systems (Resolution A. 917(22) (reprinted in MSN 1795) states: “AIS should always be in operation when ships are underway or at anchor.” There are, however, circumstances in which AIS may be switched off when under way or at anchor.

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In what circumstances may the AIS be switched off, according to IMO Guidelines?

What cautions should be given to OOWs regarding the use of AIS at sea?