Avoid random executable files claiming to be "CM93 Installers." Real CM93 charts are just a folder of .000 , .031 , etc., data files—no installer needed.
Ensure you are getting Version 2 . Version 3 is encrypted and will not work with OpenCPN . cm93 v2 charts download install
The ethical sailor treats CM93 v2 as a , not a primary source. The responsible workflow is: Avoid random executable files claiming to be "CM93