[Solved] What does 21SM mean? It's visibility in statute miles!

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#1

10@9KT is wind direction at wind speed.
At the risk of sounding stupid; what does 21SM mean.

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#2

I have no idea.

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#3

statute miles

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#4

Ah, it’s visibility!!!

#5

1SM = around 1.6KM
1NM = around 1.8KM

#6