Originally Posted by gtflash
I’ve never understood the purpose of mmsi and ssr
Well it’s what enables DSC to work and identify the radio and vessel/registrant
SSR is a vessel registry and nothing to do with MMSI numbers.....
A portable MMSI is only used with a handheld DSC VH f they are free from ofcom as posted above it’s a very simple process of filling in a form. It registers the MMSI to an individual rather than a vessel so should not be used in a fixed vhf. Of the vessels you mention some may have fixed vhf so these have their own MMSI other kayak/PWC etc are unlikely but you can keep
Your handheld DSC on you at all times regardless of the vessel you are on that day and use it (with permission of the vessels master)