The following quote is from: https://norfolkcoastamateurs.co.uk/cty-dat-country-files/
Have you ever wondered how all of the various types of amateur radio software, e.g. N1MM and DX Cluster nodes, keep up to date with the plethora of changes that occur to a simple list of countries and prefixes? These changes take place almost daily and getting it right can be vital for contest point scoring and award tracking so you need to log the correct information.
Which DXCC entity is GB4CTY located in this week? It could be any of England, Scotland, Wales, Northern Island, Guernsey or Jersey.
What about G3YPP/NHS. Surely the /N places him stateside.
It would be a remarkable feat if every single program was updated individually by their development teams every time a prefix or entity changed or a new Special Event Station was activated.
Fortunately, most logger and contest software makes use of cty.dat files which have been kept updated by Jim Reisert, AD1C as a labour of love for many, many years. Known as country files, full details can be seen on Jim’s website here: Country Files
This is from: https://www.country-files.com/contest/wsjt-x/
The WSJT-X User Guide states, “WSJT-X includes a built-in cty.dat file containing DXCC prefix information. Updated files can be downloaded from the Amateur Radio Country Files website when required. If an updated cty.dat is present in the logs folder and readable, it will be used in preference to the built-in one.”
Starting with Version 2.7, you can update the country file from within the program. In Settings, click on the Colors tab and you’ll find the information at the bottom of the window.
WSJT-X pull down File | Settings... | Colors tab
This update process simply can not be any more painless. Doing this assures that your WSJT-X decodes are identified as the correct country. And, if you use supplemental programs like JTAlert or GridTracker, they can give you audible or text/email alerts for those decodes you need.
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