Is it permissible to take off with visibility reported as 6/M/6?

The visibility reported as 6/M/6 indicates that the visibility is 6 statute miles horizontally, but there is also a mention of "M" which references a significant value, typically associated with the runway visual range (RVR). In aviation operations, takeoff visibility requirements vary based on aircraft type, airport categorization, and specific regulatory standards.

The reported visibility of 6 statute miles would generally meet or exceed the minimum requirements for takeoff in many circumstances, particularly under standard regulations. Furthermore, if the RVR is also within acceptable limits (commonly requiring certain values depending on the aircraft), then the takeoff can be performed safely.

This makes it permissible to take off when visibility is reported as 6/M/6, assuming all other operational parameters align with regulatory standards and safety protocols. In practice, this means that pilots and operators can confidently assess conditions and proceed with takeoff when visibility is adequate, as reported.