Mair, Galatea, Patricia.
There are a number of ships that visit the Port of Swansea here in Wales on regular bases, most are involved in the repair of light markers buoys around the coasts of the Bristol Channel and the Celtic Sea.
But some them also specialise in sea surveying and undersea seismic recording, the newer vessels such as the Pharos and Granuila have a all round bridge and are fitted with more powerful cranes.
Lights at sea still remain an essential aids to shipping warning of lower water and sand bars, despite GPS. Trinity house covers both the waters of Britain and Ireland very much like that of the RNLI.
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