A system is proposed which would be capable of adding information concerning the true motion of objects, to the normal relative display. The method requires the use of two Tenicon storage tubes (ME 1260).

The use of marine radar has not eliminated collisions at sea. The reasons for this failure are generally associated with limitations in interpreting the available information, rather than in the equipment itself. One particular problem is the assessment of the time, course and speed of a ship from the information presented on a radar display, which is relative to the observer. It is possible to calculate this information, but the direct presentation of a true course on the display would be advantageous. A solution is to modify the final PPI display so that the centre of the scan, normally fixed at the centre of the cathoderay tube, is displaced continuously at a velocity corresponding to the observer. The true speed and course of a ship can therefore be assessed from the track built up from echoes received during successive scans.