The GTS Finnjet was a Finnish gas-turbine car ferry, the 'GTS' in its name standing for gas turbine ship, and its horn has become a favourite among ship horn recordings shared online. The clip is a straightforward field capture of one long blast, the kind of sample collectors save for its depth and clarity. It circulates in ferry and ship horn compilations where enthusiasts compare tones across vessels. Short, recognisable and unmistakably maritime, it survives because no generic synthesised horn quite matches the weight of a real ferry's voice.