Action Stations is the general signal to the personnel of a warship (usually British or Commonwealth) that combat with a hostile attacker (contact) is imminent or deemed probable. The alarm is also used as a preventative measure: for example, just before dawn when cruising in hostile waters and the possibility of air or submarine attack is deemed particularly high, although no active contacts exist. The term is also used in Royal Navy installations and bases, as well as Royal Air Force airbases and installations. Action Stations is equivalent to the United States Navy's 'General Quarters', and replaces the 'beat to quarters' instruction common during the age of sail.

Un navire de guerre est au poste de combat lorsque toutes les dispositions, au matériel et au personnel, ont été prises pour qu’il puisse engager le combat et utiliser ses armes.

Klart skepp är en den högsta stridsberedskapsgraden för örlogsfartyg. När klart skepp har intagits, har fartyget sin största slagkraft och den högsta skyddseffekten under gång. Det innebär att all materiel är klargjord för strid och att all personal bemmannar sina drabbningsplatser.