I can't answer your question but for what its worth it is very useful.
When in September my engine failed (as a result of crud jamming the thermostat) the MMSI / callsign I gave allowed the coastguard to pull up the details of my boat. This was noted by the coastguard guys who met the lifeboat on the tow back and, if I remember, was an item on their safety checklist.
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"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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