Coordinates, CRS, and Grid Convergence

Three location concepts

Latitude/longitude identifies a geographic position. Grid Northing/Easting expresses that position within a selected projected coordinate reference system. Local North/East is an offset from a chosen origin, such as a well or pad reference.

Coordinate reference checklist

1. Verify the geodetic datum and projection zone (for example, the correct State Plane zone).
2. Check whether values are meters, international feet, or US survey feet.
3. Verify the north reference used for azimuth display and the grid convergence setting.
4. Confirm that target and polygon locations use compatible physical coordinate references.

What is grid convergence?

Grid north and true north usually differ by a local angle. DirectionalPlan can display grid- or true-referenced directions while preserving its internal planning convention. Changing display north reference does not mean the physical target moved.