@esoterra @smallJaguar @micah MMSI code is programmed into the VHF marine radio - but you only get limited attempts to enter it as an enduser before it needs programming with authorised equipment (often only available to radio dealers and has a cost). So its not unlikely that vessels are transmitting wrong code (with 252 LI instead of 525 ID ) unless the Coastguard and Communications Ministry of Indonesia orders them to be changed >>
https://icomuk.co.uk/Everything-you-need-to-know-about-MMSI-Numbers/3995/3224/
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