"Martin Rowley" schreef in bericht
...

: [BTW, quick conversion from km/hr to knots ...
:
: divide km/hr figure by 2
: add the *tens* figure of that result to itself ...
: e.g., 80 km/hr - (divide /2) - 40 (add tens fig) -44 knots. ]

Even quicker conversion from km/hr to knots
http://www.weatheronline.co.uk/windrpopup.html

Colin Youngs
Brussels