Click on Tools in the Entry window. Then click on “Download and install latest country file (wl.cty.dat)(Internet)” norfolkcoastamateurs.co.uk Contest Country Files
Most modern software includes built-in tools to automate this download. Select the Update CTY button at the bottom of the screen. N1MM Logger+ In the Entry window, click Download and install latest country file (wl.cty.dat) Manual Install Download the latest or zip file from Country-Files.com Locate your software's log or installation folder (e.g., for Tucnak or the folder for WSJT-X). Overwrite the existing file with the new one. Key Benefits of Updating Cty.dat Country Files - Norfolk Coast Amateur Radio Society
A cty.dat file is only as good as its last update. Most logging programs bundle a version with their installer, but that version might be six months or six years old. A fresh cty.dat download ensures: cty.dat download
Bookmark https://www.ad1c.us/cty/ today. Set a calendar reminder for the first of every quarter. And the next time a fellow ham complains that their logger thinks OX3LX is in Greenland (when it is, but only if the file is current), you can confidently point them to this guide.
He reopened N1MM+. He typed a test call: S55M . This time, the software instantly showed: Click on Tools in the Entry window
For example, when you type W1AW into your logging software, the program looks at cty.dat , sees that the prefix W belongs to the United States of America (DXCC 291), and fills in the country, zone, and latitude/longitude automatically.
Open your web browser and navigate to https://www.ad1c.us/cty/cty.dat . The page will either show a wall of text (prefix mappings) or prompt a download. If you see text, press Ctrl+S to save the page as cty.dat – make sure the extension is .dat , not .html . N1MM Logger+ In the Entry window, click Download
The humble cty.dat file is a masterpiece of community-driven data curation. Every time you log a QSO and the country appears correctly, you are benefiting from decades of meticulous prefix tracking by volunteers like Jim Reisert AD1C. Keeping it updated is your responsibility as an operator.
For further assistance or to learn more about cty.dat, explore the following resources:
Invoke-WebRequest -Uri "https://www.ad1c.us/cty/cty.dat" -OutFile "$env:USERPROFILE\Downloads\cty_new.dat" Copy-Item "$env:USERPROFILE\Downloads\cty_new.dat" "C:\N1MM Logger+\cty.dat" -Force
Disclaimer: URLs and software paths were accurate at the time of writing. Always verify the official source of cty.dat via reputable amateur radio forums or the ARRL website.