This file is updated regularly by Jim Reisert, AD1C, to include new countries and special prefixes. Hold the shift key when you click to download the file. Some time soon, I will add a feature to DX Monitor that will allow it to automatically check the date of the latest CTY.DAT file and retrieve it if it has been updated. CTY.DAT does not show locations more accurately than by country. The spot time is sent by the DX cluster from which the spot originated.
Some clusters have their clocks set incorrectly.
The latest documentation is on the web .