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design to meet operational needs
Discrimination in bearing discrimination in range discrimination
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accuracy action Admiralty Court aerial alter course alteration of course Annex ascer ascertained assessment automatic avoid beam width Brott change of bearing circumstances close passing closest approach clutter compass bearing computation continuous course and speed Court Crystal Jewel cumulative turn cursor danger Decca detection discrimination distance echo trails effective electronic encounter equipment error factor fog signal intelligence Justice Willmer Kelvin Hughes knots manoeuvre manual mariner marker measurement miles minutes moderate speed Nassau navigate with caution operational plotting board port presentation pulse length radar display radar observation range and bearing range factor range-scale rate of change reflection plotter relative bearing relative display relative motion relative plot relative track risk of collision Rule 16 scale scanner screen ship Sitala situation stabilised starboard stop engines targets true and relative true course true motion true plot true-motion display vessel view ahead visibility visual waveguide Westerdam yards