Why do nautical miles linger on?

I recently had an exchange of correspondence with an acquaintance (a former RAF pilot) who tried to explain to me why most of the world of aviation still uses nautical miles and knots rather than kilometres and km/h.  The explanation went like this.

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‘User-Friendly’ metric

One of our readers, John Frewen-Lord, asks why popular resistance to the simplicity of metric measures is now limited to a few English-speaking countries. With change in the air, he makes a few suggestions to help the stalled metric changeovers. If you are a Metric ‘Purist’, turn away now…

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Is this the UK’s oldest kilometre sign?

A sign showing kilometres on the route of the first ‘London’ marathon had its anniversary this week. For a century, it has pointed the way for anyone trying to retrace the steps of the original runners towards the finishing line at White City in London, where the 1908 Olympic Games were held.

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Metric, a truly natural system

At the time of writing NASA scientists are eagerly awaiting the results of soil sampling from their latest Martian probe Phoenix. Crucial to that experiment is confirmation of the presence of water. That precious substance essential to all life both here on Earth and maybe elsewhere. It also plays a big part in shaping the world geologically and meteorologically both here and possibly on Mars. What more natural a substance to choose for defining a unit of mass as was the case originally with the metric system.

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