Source: EPSG:4279 — OS(SN)80
geographic system using latitude and longitude on an ellipsoid · Area of use: Europe - British Isles - UK and Ireland onshore
+proj=longlat +ellps=airy +no_defs +type=crsMore about EPSG:4279 →
Convert EPSG:4279 to EPSG:4269
Online coordinate converter from OS(SN)80 (EPSG:4279) to NAD83 (EPSG:4269). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
Convert EPSG:4279 to EPSG:4269 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4279", "EPSG:4269", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:4269 — NAD83
geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD83
+proj=longlat +datum=NAD83 +no_defs +type=crsMore about EPSG:4269 →
Frequently asked questions
- How accurate is converting OS(SN)80 to NAD83?
- Projection-only conversions are accurate to floating-point precision. If a datum shift is involved, browser-based tools use Helmert parameters which are accurate to roughly 1-5 m; for surveying-grade work apply the official grid-shift transformation in a desktop GIS.
- Does my data leave the browser when I use this converter?
- No. All coordinate transformations are computed locally in your browser using proj4js. The coordinates you enter are never transmitted to any server.