Check out this post: Wind speeds in m/s - #2 by N6722C. Only US.SYSTEM (imperial) uses speed in knots, the other 2 ones are using m/s as per design, they are not considering it as a bug:
Wind speeds in m/s - #16 by Jummivana
Check out this post: Wind speeds in m/s - #2 by N6722C. Only US.SYSTEM (imperial) uses speed in knots, the other 2 ones are using m/s as per design, they are not considering it as a bug:
Wind speeds in m/s - #16 by Jummivana