Aviso



An aviso (formerly also an adviso), a kind of dispatch boat or advice boat, survives particularly in the French Navy, equivalent to the modern sloop.

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 guns, two 138 mm guns or four 100 mm guns. In English they are often referred to as sloops. Colonial avisos, such as the intended for overseas service, were larger.

The Portuguese Navy built avisos to operate in the Portuguese Empire. The Portuguese built 1st Rate avisos (Afonso de Albuquerque class) of 2,400 tons and 2nd Rate avisos (NRP Gonçalo Velho and Pedro Nunes classes) of 1,200 to 1,700 tons. In 1932 the Portuguese s were also classified as 2nd Rate avisos.

Modern avisos have grown to become combat-capable ships, smaller than a corvette but larger than patrol ships. They typically have roles in anti-submarine warfare and coastal defence. In NATO classification they are usually recognized as corvettes.