Label | Explanation | Data Type |

Input Features | The input feature class (points, multipoints, lines, and polygons). | Feature Layer |

Angle Field | The existing field that will be populated with the true north calculation value in decimal degrees. | Field |

Rotation Method (Optional) | Specifies the method used to calculate the rotation value. - Geographic — The angle is calculated clockwise with 0 at the top. This is the default.
- Arithmetic — The angle is calculated counterclockwise with 0 at the right.
- Graphic — The angle is calculated counterclockwise with 0 at the top.
| String |

Coordinate System Field (Optional) | The field containing a projection engine string for a projected coordinate system to be used for angle calculation. The angle calculation for each feature will be based on the projected coordinate system projection engine string for the specific feature. In cases of an invalid value, the tool will use the cartographic coordinate system specified in the Cartography environment settings. The default is none, or no field specified. When no field is specified, the projected coordinate system used for calculation will be taken from the Cartography environment settings. | Field |

### Derived Output

Label | Explanation | Data Type |

Output Features | The updated feature class with calculated rotation values. | Feature Layer |