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## 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 |

Eqn (E-3) |

Eqn (E-4) |

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