Simple answer is it's the NA VHF contest mode (CM).  Some FFMA grid rovers also use it as it's quicker and only exchanges grid squares.  

73's
George - WB5JJJ


4


On Mon, Jul 18, 2022 at 5:23 PM John McKinnie <kt4ac@att.net> wrote:
Periodically, I will see band activity like is highlighted with the red arrow below. This is on 6 Meter FT8.

Does anyone know what this information means? 

Regards,
John
KT4AC


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