I’m having trouble finding this in the documentation.
What is the default 5 ghz scan-list?
Scan list uses frequencies allowed in your country or frequencies from ‘interface wireless info print’.
If no country is selected, the following frequencies should be used,
http://www.mikrotik.com/testdocs/ros/2.9/interface/wireless.php?permalink=0.12361736720061835
or ‘interface wireless info print’.
each card has a different list of supported frequencies, which then gets reduced to what is allowed in your selected frequency-mode. the result can be seen in /wireless info print