An aviso (formerly also an adviso ), a kind of dispatch boat or advice boat, survives particularly in the French navy.
The Dictionnaire de la Marine Française 1788 – 1792 (by Nicolas-Charles Romme) describes avisos as "small boats designed to carry orders or advices".
French World War I avisos, used also during World War II, had displacement 300-700 tons, speed 13-20 knots, main armament usually of two 100 mm or 138 mm guns or four 100 mm guns. In English nomenclature they are often referred to as sloops. Bigger were colonial avisos Bougainville class, intended for overseas
service.
The Portuguese Navy also built colonial avisos in the 1930s, to operate in the Portuguese Colonial Empire. The Portuguese built 1st Rate avisos (Afonso de Albuquerque class) with 2400 tons and 2nd Rate avisos (João Velho and Pedro Nunes classes) with 1200-1700 tons. In 1932, the Portuguese Flower class sloops were also classified as 2nd Rate avisos.
Modern avisos have grown to become combat-capable ships, smaller in size than a corvette, but larger than patrol ships. They typically have roles in anti-submarine coastal defence. In NATO classification they are usually recognized as corvettes.
See also Flores class'' sloop Category:Naval ships of Francede:Aviso (Schiff)el:Αβιζόes:Aviso (buque)fr:Avisoja:通報艦pl:Awizo (klasa okrętów)pt:Avisoru:Авизо (судно)
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