Definitions of terms to be used in connection with ARPA performance IMO standards
Target | means any object fixed or moving whose position and motion is determined by measurements of range and bearing on radar. |
Relative Course | means the direction of motion of a target relative to own ships position expressed as an angular displacement from north. It is deduced from a number of measurements of target range and bearing of own ship s radar. |
Relative speed | means the speed of a target relative to own ship`s position. It is deduced from a number of measurements of target range and bearing on own ship` s radar. |
Relative Motion | means the combination of relative course and relative speed. * Refer to IEC 872: Marine Automatic Radar Plotting AIDS (ARPAs). |
True course | means the true direction of motion of a target expressed as an angular displacement from north. It is obtained by a vector combination of target relative motion and own ship`s true. |
True speed | means the speed of a target obtained by a vector combination of target relative motion and own ships`s true motion. |
True Motion | means the combination of true course and true speed. |
True bearing | means the direction of a target from own ship expressed as an angular displacement from north. |
Relative Bearing | means the direction of a target from own ship expressed as an angular displacement from own ship`s heading. |
True Motion Display | means a display across which own ship and each target moves with its own true motion. |
Relative Motion Display | means a display on which the position of own ship remains fixed and all targets move relative to own ship. |
Azimuth Stabilised Display | means a display in which the azimuth orientation relative to a nominated true bearing is fixed. |
North-up Display | means an azimuth stabilised display in which a line connecting the centre with the top of the display is north true motion. |
Course-up Display | means an azimuth stabilised display in which a line connecting the centre with the top of the display is own ship`s intended course. |
Heading | means the direction in which the bows of a ship are pointing expressed as an angular displacememnt from north. |
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