Converting Latitude

• 1). Take the latitude point, in the number of degrees, of your starting point -- Point A.
  
  
• 2). Locate the latitude of your finishing point -- Point B -- along the same longitude. If you're on the northern hemisphere, this number is higher if you're traveling north and less if going south. It is the opposite on the southern hemisphere.
  
  
• 3). Subtract the lower number from the higher number to get the distance in latitude degrees.
  
  
• 4). Multiply this number by 69 to get the distance in miles.
  
  

Calculating Longitude

• 1). Measure the distance from point A to B in longitude using the same method of subtracting the smallest longitude from the largest.
  
  
• 2). Locate and record the latitude that these two longitude points travel along. The distance from one longitude degree to the next is 69 miles if the latitude is between 1 and 7 degrees.
  
  
• 3). Subtract one mile from 69 if the latitude is between 8 and 12. Subtract an extra mile for every three latitude degrees up to 18. Subtract another mile for every two degrees from 19 to 33 and one mile for every degree after that
  
  
• 4). Multiply the first number you got (from measuring the distance in longitude) by the second number (calculating the miles by latitude position) to get the mileage.