A lookout or look-out is a person in charge of the observation of hazards. The term originally comes from a naval background, where lookouts would watch for other ships, land, and various dangers. The term has now passed into wider parlance.

Naval application

Lookouts have been traditionally placed in high on masts, in

crow's nest A crow's nest is a structure in the upper part of the main mast of a ship or a structure that is used as a lookout point. On ships, this position ensured the widest field of view for lookouts to spot approaching hazards, other ships, or land b ...

s and

tops Total Operations Processing System (TOPS) is a computer system for managing railway locomotives and rolling stock, known for many years of use in the United Kingdom. TOPS was originally developed between the Southern Pacific Railroad (SP), S ...

. The International Regulations for Preventing Collisions at Sea (1972) says in part: : Every vessel must at all times keep a proper look-out by sight (day shape or lights by eyes or visual aids), hearing (sound signal or

Marine VHF radio Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-a ...

) and all available means (e.g.

Radar Radar is a detection system that uses radio waves to determine the distance ('' ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, we ...

, ARPA,

AIS AIS may refer to: Medicine * Abbreviated Injury Scale, an anatomical-based coding system to classify and describe the severity of injuries * Acute ischemic stroke, the thromboembolic type of stroke * Androgen insensitivity syndrome, an intersex ...

GMDSS The Global Maritime Distress and Safety System (GMDSS) is a worldwide system for automated emergency signal communication for ships at sea developed by the United Nations' International Maritime Organization (IMO) as part of the SOLAS Convent ...

...) in order to judge if risk of collision exists. Lookouts report anything they see and or hear. When reporting contacts, lookouts give information such as, bearing of the object, which way the object is headed, target angles and position angles and what the contact is. Lookouts should be thoroughly familiar with the various types of distress signals they may encounter at sea.

Criminal definition

By analogy, the term "lookout" is also used to describe a person who accompanies criminals during the commission of a

crime In ordinary language, a crime is an unlawful act punishable by a state or other authority. The term ''crime'' does not, in modern criminal law, have any simple and universally accepted definition,Farmer, Lindsay: "Crime, definitions of", in Ca ...

, and warns them of the impending approach of hazards: that is,

police The police are a constituted body of persons empowered by a state, with the aim to enforce the law, to ensure the safety, health and possessions of citizens, and to prevent crime and civil disorder. Their lawful powers include arrest and th ...

or eyewitnesses. Although lookouts typically do not actually participate in the crime, they can nonetheless be charged with

aiding and abetting Aiding and abetting is a legal doctrine related to the guilt of someone who aids or abets (encourages, incites) another person in the commission of a crime (or in another's suicide). It exists in a number of different countries and generally allo ...

or with

conspiracy A conspiracy, also known as a plot, is a secret plan or agreement between persons (called conspirers or conspirators) for an unlawful or harmful purpose, such as murder or treason, especially with political motivation, while keeping their agre ...

, or as

accomplice Under the English common law, an accomplice is a person who actively participates in the commission of a crime, even if they take no part in the actual criminal offense. For example, in a bank robbery, the person who points the gun at the teller ...

Railway use

A lookout may be used when performing engineering works on an operational railway. They will be responsible for ensuring that all staff are cleared of the track in advance of an approaching train.

References

Crime Marine occupations {{Job-stub