Taken from OFCOM Guidence
Clause 2(1)(a) - Maritime Mobile
2.15 The Licence provides that only a Full licensee may operate ‘Maritime Mobile’.
This expression refers to a ‘Vessel at Sea’ and that expression, in turn, refers to operation on
the seaward side of the low-water line but without imposing any further territorial
restriction. Holders of a Full Licence may thus operate beyond the extent of UK territorial seas.
2.16 Maritime Mobile operation is therefore a privilege reserved for these licensees. It is an incentive to those at the Foundation and Intermediate level to progress to the level of the Full licensee.
2.17 Although ‘Maritime Mobile’ operation is reserved for holders of a Full Licence, the holder
of a Foundation or Intermediate licence may operate on UK inland or internal waters,
including, for example, marinas. This would be ‘Mobile’ operation.