There are no extra buttons or switches on the display unit and no auxiliary lines on the screen to determine collision danger or plan evasive action; the presentation of the traffic situation improves as the range closes. Motion relative to the horizon is also shown and this increases with decreasing range. Distant objects are pictured small, while approaching objects increase in size. This corresponds with their immediate importance to the operator. There is no excess information on the horizontal display, which should help the operator to make quick decisions in difficult situations. The horizontal display answers the following critical questions: Is there a danger of collision and a need to take evasive action: Is the target ship passing to starboard or to port, or is her bearing to port or starboard changing? To which side should the manoeuvre be directed to enlarge the safe passing distance? Did an evasive manoeuvre have the anticipated effect? State of development. A first prototype of the horizontal display has been built and tested at sea, but the early results were disappointing. The presentation of data on the screen was unsatisfactory and there was some doubt about producing the new device economically. Eventually a computer program was developed and tested to examine different presentations of a range of traffic situations on the horizontal display screen. The results of these tests have confirmed the decision to construct an improved prototype which will also be tested at sea.

  • Availability:
  • Corporate Authors:

    Royal Institute of Navigation

    Royal Geographical Society, 1 Kensington Gore
    London SW7,   England 
  • Authors:
    • Hinsch, W
  • Publication Date: 1977-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00168216
  • Record Type: Publication
  • Source Agency: Journal of Navigation
  • Files: TRIS
  • Created Date: Jan 30 1978 12:00AM