The first of three Royal Navy warships being built on the River Clyde was unveiled at BAE's Scotstoun yard on Wednesday.
HMS Forth is part of a £348m contract to build vessels to support counter-terrorism, counter-piracy and anti-smuggling operations.
It is the first complex warship to be fully assembled at Glasgow since Type 45 destroyer HMS Duncan in 2010.
The ships are being built at the company's yards at Scotstoun and Govan.
HMS Forth will be ready in 2017, with the other ships to be named HMS Medway and HMS Trent.
The ocean patrol vehicles are capable of being deployed around the world with a range exceeding 5,000 nautical miles - the equivalent to a journey from Portsmouth to Rio de Janeiro - and a maximum speed of 24 knots. Variants of this design are already in service in Brazil and Thailand.
They will be able to carry the latest Merlin helicopters and special forces personnel.
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