Loran to GPS conversion

I am looking to convert some Loran coordinates to GPS Lat/Long.
Does anyone know how this is done "manually". My GPS has a feature, but it seems it needs some sort of area/tower I.D. number that keeps me from converting the loran numbers I have.
These numbers are for the Dog Island area as well as some for Destin. Is the "I.D. number" different for differend areas?
Thanks in advance for your help.
Does anyone know how this is done "manually". My GPS has a feature, but it seems it needs some sort of area/tower I.D. number that keeps me from converting the loran numbers I have.
These numbers are for the Dog Island area as well as some for Destin. Is the "I.D. number" different for differend areas?
Thanks in advance for your help.