[Rockin Robbins]

One nautical mile is close enough to spit the distance from 2000 yards. Your ruler and compass measure in yards up to 5 miles and then by nautical yards. Just take the number of yards, divide by 2 and slide that decimal three places left and you have just converted to nautical miles. Example: 5200 yards / 2 = 2600. slide the decimal three places left and you have 2.6 nautical miles. You can do that really quickly in your head without any aids whatsoever. Then you can plot the old way!