Quote Originally Posted by Bob Dingley View Post
Well, if you are on the ground weather is expressed in farenhite and statue miles. once airborne its Celsius and nautical miles. Air space is measured off in NM, but cloud clearance is statute miles. They do this just to mess you up.

NM's have a relationship to latitude. Those black lines on a chart that run north and south have "tic" marks spaced in nautical miles and are a handy scale. Don't try it with the lines running E & W. They are distorted by the way they converge near the poles. They also do this to mess you up.

Bob
Thanks for a good chuckle!