If you have any interest in handheld DSC radios, you will find this web page to be fascinating. Note: that the UK requires a separate license for EACH handheld, they are assigned individual MMSI numbers. And the license is not good out side of the UK or its territorial waters. If the radio is sold the license must be transferred to the new owner, including the MMSI number. Summary: what does all this mean to US users and those in other countries? I'll be hanged if I can figure it out. http://licensing.ofcom.org.uk/radiocommunication-licences/ships- radio/faq/vhf-faq/ Try this web page as well http://www.charterworld.com/news/handheld-vhf-radios-solutions-superyachts I ran across some other material that suggests that all the handhelds have the same MMSI number... Go figr. -- Capt. Mike Maurice Tigard, Oregon