## 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,

 Figure E-3 Adjusted Latitude and Departure

 Equations E-1 and E-2

 Equations E-3 and E-4

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