I was almost more confused than ever after reading this:
http://en.wikipedia.org/wiki/Nautical_mile
until I read this part:
"Conversions to other units
Visual comparison of a nautical mile, statute mile, and kilometre
One nautical mile converts to:
1,852 metres (exact)
1.150779 miles (statute) [1] (exact: 57,875/50,292 miles)
2,025.372 yards (exact: 2,315,000/1,143 yards)
6,076.1155 feet (exact: 2,315,000/381 feet or 1,822,831/300 survey feet)
1,012.6859 fathoms (exact: 1,157,500/1,143 fathoms)
10 international cables (exact)
10.126859 imperial (100-fathom) cables (exact: 11,575/1,143 imperial cables)
8.439049 US customary (120-fathom) cables (exact: 57,875/6,858 US customary cables)
0.998383 equatorial arc minutes (traditional geographical miles)
0.9998834 mean meridian arc minutes (mean historical nautical miles)"
so JAC, what measure is the 500?
here:http://www.jma.go.jp/en/typh/0914.html
it currently says Area of 50kt winds or more Wide 200km(110NM)
I'm so confused... |