What is SSAS or Ship security and alert system and its details?

1. Ships constructed on or after 1 July 2004,
2. Passenger ships and passenger high-speed craft constructed before 1 July 2004 not later than at the first survey of their radio installation after 1 July 2004,
3. Oil tankers, chemical tankers, gas carriers, bulk carriers and cargo high-speed craft of 500 GT and above constructed before 1 July 2004 not later than at the first survey of their radio installation after 1 July 2004.
4. other cargo ships of 500 GT and above constructed before 1 July 2004 and mobile offshore drilling units not later than at the first survey of their radio installation after 1 July 200.

When ship security alert system activated:

Initiate and transmit a ship-to-shore security alert to a competent authority designated by the Administration, which in these circumstances may include the Company, identifying the ship, its location and indicating that the security of the ship is under threat or it has been compromised and continue the ship security alert until deactivated and/or reset.
For security reasons, a ship security alert system is necessary on board for initiating and transmitting a ship-to-shore security alert to a competent authority designated by the Administration.
Mandatory requirements and guidance for SSAS system.