The results of this evaluation program demonstrate that the Proximity Warning Principle has considerable utility as both an operational aid to the watch officer and a method of improving the safety of ships at sea. This is particularly true if the device used to implement the principle has an adequate detection range. A reliable range of 10 to 12 miles would permit the watch officer to make maximum use of a Proximity Warning Alarm. The original system concept intended that the Lookout Assist Device would service as a conning aid on the high seas. In this environment the unit in its present form is quite useful over a limited ship-to-intruder range. Data indicates a high probability of detection of all vessels properly classified as ships which intrude within an outer guard ring interval from 4.5 to 6 miles. All metal hull boats of LCI size or larger should be detected in the inner guard ring. In coastal waters the system is not as good as it is on high seas due to the nature of targets encountered. The safety of small craft and the ship lookout function would be greatly improved if all small craft operating in shipping lanes were required to mount radar reflectors. An even more serious condition exists in the case of towed barges encountered in both coastal and inland waters. These may pass undetected through both rings. This type of intruder represents a real danger to the seagoing vessel.

  • Corporate Authors:

    Sperry Piedmont Company

    Division of Sperry Rand Corporation
    Charlottesville, VA  United States 
  • Publication Date: 1966-3

Media Info

  • Pagination: 65 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00026977
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: Pub-JA-240-0007-30 Final Rpt
  • Contract Numbers: MA-3374
  • Files: TRIS
  • Created Date: Mar 2 1973 12:00AM