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Andren software has a special subroutine which will accurately make the loran to gps conversion, if you have a local waypoint at which you simultaneously measure both loran readings and lat/lon readings. You enter both readings, and the Andren program will then calculate a correction factor which it applies to all the other conversions in the area. This solves the problem which most people have with getting accurate conversions. Using the programs that are included with some GPS units has resulted in waypoints which are close to 1/2 mile off for me.
