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It means Alternate (Temporary Address), Portable (Walking or Cycling), Mobile using the vehicles or inland boats' electric supply, MM is MARITIME MOBILE i.e. it is on a ship at SEA not on inland waters - rivers, lakes, canals. It requires the permission of the Ships owners and Master to be operated. In the UK there is no AM - Aeronautical Mobile except under special conditions. G4YRS. — Preceding unsigned comment added by 22.214.171.124 (talk) 17:41, 10 February 2015 (UTC)