"Pete S" wrote in message ...
Looks like they made the mistake of assuming that a nautical mile was 6000
feet when it's actually 6080 ft

No, it's actually 1852 m in today's world. Your 6080 ft is 1853.184
m, all around the world since an international agreement on the
definition of the yard (and thus feet, inches, etc.) over 40 years
ago.

Gene Nygaard
http://ourworld.compuserve.com/homepages/Gene_Nygaard/