EPSG:CODE

OSGB36 to ED50 (1)

EPSG:4277 → EPSG:4230

Coordinate Reference Systems

Source CRS
EPSG:4277
OSGB36
Geographic 2D
Target CRS
EPSG:4230
ED50
Geographic 2D

Transform Coordinates

Remarks

Known as the "UKOOA landward/seaward transformation". This transformation is concatenated from OSGB36 to WGS 84 (6) (Petroleum) (code 1314) minus ED50 to WGS 84 (18) (Common Offshore) (code 1311). Accuracy better than 4m and generally better than 2m.

Frequently Asked Questions

How do I convert OSGB36 to ED50 coordinates?

Use the coordinate transformation tool above to convert OSGB36 (EPSG:4277) to ED50 (EPSG:4230). Enter your source coordinates and click Transform. This uses the Position Vector transformation (geog2D domain) method with 2m accuracy.

How do I transform OSGB36 to ED50 using Proj4js?

Use proj4.defs to define both EPSG:4277 and EPSG:4230, then call proj4(source, target, [x, y]) to convert coordinates programmatically.

What is the accuracy of the OSGB36 to ED50 transformation?

This transformation (EPSG:1315) has an accuracy of 2m using the Position Vector transformation (geog2D domain) method. Area of use: UK - Great Britain onshore and nearshore; Isle of Man.