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When the units are given in yards, then you convert them into meters in the metric system. No sudden changes to kilometers or centimeters are allowed.
In the metric system, BIG guns are measured with bores in centimenters, and not in millimenters. This ought to be common sense. I don't go the the store and order soup by the milliliter. I use larger units for larger things. I buy coal by the tonne, not by the gram.
For example: 30 cm and not 300 mm
Kilometers per hour is abbreviated k.p.h. Simple, isn't it? (No fractions, etc.)
The U.S. Navy has long had standard ways of expressing gun bores in the English system. Use them: 3-inch, 4-inch, 5-inch, 6-inch, 8-inch, 10-inch, 11-inch, 12-inch, 14-inch, 15-inch, 16-inch.
I bet that you will find the same in the long histories of the R.N., R.A.N., R.C.N., R.N.Z.N., etc.
In this article, the USS Tennessee was stated as having some 6-inch guns. I don't think that this was ever true! 6-inch guns are for cruisers.
Our Navy has had 18-inch and 21-inch torpedoes, and some I.J.N. torpedoes were listed as 24-inch by us - but only fires from surface ships: cruisers and destroyers. Submarines and aircraft had smaller torpedoes.
Our Navy has had smaller weapons with explosive shells measured as 20-mm, 25-mm, and 40-mm. The few ships of the Zumwalt class will have 155-mm guns (6.1-inch). If you ever see 76-mm, that is the same as 3-inch, but made in Italy for the Oliver Hazard Perry class frigates. The 25-mm gun is the same rapid-fire gun that goes on a Bradley Fighting Vehicle for the Army.
There are exactly 60 nautical miles in one degree of latitude - but not longitude, where it varies. 98.67.97.60 (talk) 07:59, 15 May 2012 (UTC)[reply]
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