Coordinate transformations to NAD83

The EPSG Geodetic Parameter Dataset defines official transformations from 9 coordinate reference systems to NAD83 (EPSG:4269). Each page lists the published parameters, accuracy and area of use, with a free in-browser converter.

• ATS77 → NAD83±0.5 m
• NAD27 → NAD83±0.15 m
• NAD27(76) → NAD83±1 m
• NAD27(CGQ77) → NAD83±1 m
• Old Hawaiian → NAD83±0.2 m
• Puerto Rico → NAD83±0.05 m
• St. George Island → NAD83±0.15 m
• St. Lawrence Island → NAD83±0.5 m
• St. Paul Island → NAD83±0.5 m