2. Compass Rule

The Compass Rule (also known as the Bowditch Rule) applies a proportion of the closure error to each line.

For any line IJ, Figure E-3,

img12
Figure E-3
Adjusted Latitude and Departure

 

img20      Equation E-3

 

img21       Equation E-4

 

The Compass Rule distributes closure error based on the proportion of a line's length to the entire distance surveyed.