Knots are not dimensionless in aviation. A knot is one nautical
mile per hour, and that nautical mile is the distance corresponding to
one minute of latitude at the equator. Anyone using lat/long and some
spherical trig (like the old guys who crossed oceans used sextants to
determine their position) will make use of these things. The lazy ones
among us (or like me, the ones really poor at math) will use GPS, which
does the same thing.


Dan


One minute of Latitude is 1nm, whether at the equator or just shy of the
pole.. it does not change

As for sextants.. I must be an old guy then.. as I have crossed the oceans
of air, relying on the celestial realm, my trusty sextant, a good watch and
lots of math.

BT