Innaval terminology, aplot is a graphic display that shows all collated data from a ship's on-board sensors, i.e.radar,sonar andEW systems. They also displayed information from external sources - for example, other vessel or aircraft reports. There are four different types of plot, each with varying capabilities, i.e. range, depending on their role;^[1]

• Air plot: Used for tracking air contacts, i.e. planes and EW information.
• Surface plot: Used for tracking contacts on the surface of the water, i.e. other ships.^[2][3][4] It can also perform a variety of roles such as:
  • Providing a trace of a ship's own course and speed over time.^[2][4]
  • Plotting the position of aman overboard.^[2]
  • Can be used innaval gunfire support missions to plot unidentified contacts and keep track of friendly forces.^[3]
  • It also plays an important part inanti-submarine warfare operations and usingtorpedoes.^[3]
• Sub-surface plot: Used for tracking contacts below the surface of the water, i.e. submarines.
• General operations plot: Used for tracking shipping on a large-scale chart. Was also used to display exercise boundaries, airplanes and other significant features of maritime interest. In theRoyal Australian Navy, the scale used was generally 5 or 10 miles (8.0 or 16.1 km) per 1 inch (25 mm).

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