A Loran-C Precision Guidance System with the capability to be used as a research and development tool was designed and assembled for the purpose of examining the feasibility of using Loran-C to navigate ore carriers in the St. Marys River. The system consists of a Loran-C receiver, a minicomputer, a mini data station for displaying navigational data, a flexible disk system, a 17-inch graphics unit for displaying a prestored representation of the St. Marys River, and a gyrocompass interface unit for interfacing with ship's gyrocompass. The system was initially installed on the U.S. Coast Guard Cutter NAUGATUCK, a 110-foot tug boat, for calibration, verification, and demonstration, in conjunction with a special four-station Loran-C "Mini-Chain" on the St. Marys River. Later the system was installed on the USCGC MACKINAW, a 290-foot icebreaker, for further evaluation and demonstration. Positional jitter of 50 to 75 feet (2dRMS, 95%) was achieved. Additional testing will be done aboard an ore carrier to determine how well the system meets the Coast Guard's accuracy objective of +25 feet maximum cross-track error 95% of the time.

  • Supplemental Notes:
    • Prepared for U.S. Department of Transportation, United States Coast Guard Office of Research and Development, Washington, D.C. 20590.
  • Corporate Authors:

    Teledyne Systems Company

    19601 Nordhoff Street
    Northridge, CA  United States  91324
  • Publication Date: 1977-2

Media Info

  • Pagination: 141 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188831
  • Record Type: Publication
  • Source Agency: United States Coast Guard
  • Report/Paper Numbers: CG-D-57-77 Final Rpt.
  • Contract Numbers: DOT-CG-61419-A
  • Files: TRIS
  • Created Date: Mar 14 1979 12:00AM