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There is one commercial software (Windows and Mac) that does it: LORANGPS from Andren Software (Andren Software - LoranGPS Loran GPS Conversion Software, Plot, Map, Upload your coordinates to your GPS directly.). Downloaded the program is $85.

There is also a public domain program available from the International Loran Association, downloadable from http://www.loran.org/gptotd.zip
the notes to that program are at http://www.loran.org/GPtoTDNotes.txt

The problem with all conversions of LORAN to lat/long is the local variations of signal timing due to overland signal distortion. Unless you use the local-specific correction data, the software can only do +- 200 yard accuracy. The commercial software from Andren is reported to do a pretty good job with using look-ups for the local corrections.

Good luck
 

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Some better GPS units have a "ghost" loran program.You could put in your old loran #'s and see how close it gets you.

I found it to get you close but not perfect.

You can also plot your old loran #'s onto a chart - then read the lat/lon numbers that way.
 
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