No, these codes are all ICAO standard worldwide. 7700 is internationally the get everyone’s attention code. Just that each nation uses a different little ryme to remember their purpose.
The UK VFR code is 7000, 1200 in the USA.
The 7000 code is said to enable any of the 3 emergency codes to be dialled in with only one change to the transponder wheels from the days when transponders had four wheels rather than push buttons to change the code.
1 Like