Looks good on paper Geoff, that's the way it was created.
I use both systems easily, and can convert from one to the other fairly well. Imperial measurements are easier to break down to smaller units than metric without having to resort to fractions. Metric can generally be multiplied easier.
Metric doesn't cover all bases of measurement very well though. Imperial does.
1 nautical mile is the distance of 1 minute of arc along a meridian (average) = 1.85??kms.
60 nautical miles is 1 deg of arc = ?????? kms. Too hard
5400 n/miles is 90 deg of arc = 10000kms + the bit they forgot to measure
