David CL Francis wrote:

I am not sure if the UK nm still exists - that was 6080 ft. Does anyone
know how the UK came to have their own version? I assume it has
disappeared but I am not sure when it did.

According to a reference I found on British measurements, the nautical mile is --
"Unit of length, normally at sea or in the air. Originally, the Admiralty fixed it at
6080 feet. This unit is universally used by international law by ships and aircraft,
as is the derived unit of the knot.
In the 20th century, an international nautical mile was defined as 1852 metres, and
so you will sometimes see the 6080ft nautical mile called the British nautical mile."

So it would seem that the international nautical mile is not used for navigation.

George Patterson
If a man gets into a fight 3,000 miles away from home, he *had* to have
been looking for it.