Source: 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 →
Convert EPSG:4269 to EPSG:4609
Online coordinate converter from NAD83 (EPSG:4269) to NAD27(CGQ77) (EPSG:4609). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
The EPSG dataset defines official transformation parameters for the reverse direction. See NAD27(CGQ77) to NAD83 — the parameters are invertible.
Convert EPSG:4269 to EPSG:4609 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4269", "EPSG:4609", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:4609 — NAD27(CGQ77)
geographic system using latitude and longitude on an ellipsoid · Area of use: Canada - Quebec
+proj=longlat +ellps=clrk66 +no_defs +type=crsMore about EPSG:4609 →
Frequently asked questions
- How accurate is converting NAD83 to NAD27(CGQ77)?
- 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.