JUDGING A SHIP'S LATERAL POSITION AND DIRECTION OF MOTION WITH SIMULATED VISUAL AIDS TO NAVIGATION

An appropriately designed parallax (two-station) range allows a mariner to accurately determine a range line--the correct path to steer a vessel--at great distances. Less expensive alternatives to parallax ranges are desirable, and many ideas for single-station ranges have been proposed, but mariners' abilities to establish range lines with them have not been measured. The present work quantified the sensitivity of three different range systems and determined how much information can be provided by a range in order to achieve a criterion performance level. These systems use (a) temporal characteristics, (b) spatial representation, or (c) color changes of the signal to represent changes in lateral position. Range systems were simulated either opto-mechanically or on a high-resolution computer display system. The ability of the mariner to determine both lateral position in a channel and direction of motion across a channel was assessed psychophysically for each range. The performance was compared with that obtained with a parallax range. This allowed quantification of performance and evaluation of the implications of replacing parallax ranges with the single-station ranges.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 58-67
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00621453
  • Record Type: Publication
  • ISBN: 0-309-05164-9
  • Files: TRIS, TRB
  • Created Date: Apr 30 1992 12:00AM