On 11 Jul 2009, at 2:59pm, Tony wrote:

> I am looking for ways to convert Loran C data to Lat Lon for my GPS.
> Any help greatly appreciated.

LORAN uses Time Difference expressions. Unless you have local data
for the conditions around your points your precision will be low.
Conversion from one to another isn't a simple matter of a few
equations. You should take a look at

http://www.flfish.com/gps_index/loran_gps.htm

and

http://www.uscg.mil/hq/cg9/rdc/default.asp?page=misc/posaid.asp&rn=off

Note that your GPS unit probably uses WGS 84, which is the same as NAS
83.

Simon.