Barnacle, you forgot 40 perches to a rood and 4 roods to an acre.
I figured that was confusing even by imperial measures: I mean, a perch is *either* one rod or one rod square, depending what you're talking about...
Being a Yachtie, we still talk in Nautical Miles, being 6080 feet. Of course, one minute of Latitude is also a NM and hence there is no scale of distance on an Admiralty Chart.
Which is why the nautical mile came about, of course - same reason as the km, except that that's based on one
French minute of arc based on 100 grads to the quadrant.
And let us not forget that the NM isn't *quite* one minute; it's a touch different at the poles and at the equator, what with the world being all squidgy and out of shape.