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*** Special Notice: *** Please be advised that our mailing address has changed and is now: U.S. Coast Guard Navigation Center, NAVCEN MS 7310, 7323 Telegraph Road, Alexandria, VA 20598 - 7310. Mail sent to our previous address will not be delivered. Please contact us with concerns or questions. Our physical location remains the same. Thank you for your attention to this matter.
LORAN C
Primary Mission Areas:
Maritime Information:
CONVERTING TDs TO LAT-LONG

The Coast Guard Research and Development Center has developed "Coast Guard POSAID2 ver 2.1a", a DOS-based program for converting LORAN-C TD's to latitude and longitude. The conversion is based on the Sodano (1965) method taken from McCullough, J, et al, "LORAN-C Latitude-Longitude Conversion At Sea Programming Considerations". The original reference for the conversion is: Sodano, E.M., 1965, General non-iterative solution of the inverse and direct geodetic problems: Bulletin Geodesique, annee, Nouvelle Serie, no. 75.


 
U.S. Coast Guard Navigation Center, NAVCEN MS7310, 7323 Telegraph Road, Alexandria, VA 20598-7310 | (703) 313-5900