How far off station is North Ryde Middle.

Queen's Harbour Master Portsmouth
NAVWARN No 5/16
NORTH RYDE MIDDLE BUOY OUT OF POSITION

1. NORTH RYDE MIDDLE BUOY (PORT HAND LATERAL MARK) LOCATED IN THE EASTERN SOLENT IS REPORTED TO BE 11.7M WEST OF ITS CHARTED POSITION.

2. MARINERS ARE TO BE NAVIGATE WITH DUE CAUTION IN THE VICINITY.


http://www.royalnavy.mod.uk/qhm/portsmouth/local-notices/navigational-warnings/2016/1605
Nautical mile normally abbreviated M, NM, nmi
Metre normally abbreviated m

11.7 NM is good distance :)
 
Assuming they obviously mean metres, it is still quite interesting that the issue an NTM for such as small distance. I was at a presentation last year by an ABP chap, who said they monitor the main buoys to ensure they are within a 10m radius of their defined lat/long.
 
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