Convert JAD69 to WGS 84

Convert coordinates from JAD69 (EPSG:4242) to WGS 84 (EPSG:4326) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

From

Input (lon, lat (decimal degrees))

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-4242-to-epsg-4326

Official EPSG transformations from JAD69 to WGS 84

The EPSG Geodetic Parameter Dataset defines 3 transformations between JAD69 (EPSG:4242) and WGS 84 (EPSG:4326). Each applies to a specific area — pick the one whose area of use covers your data.

JAD69 to WGS 84 (3)

EPSG:15927±1 mBest accuracy

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Jamaica - onshore
Scope:: Transformation of coordinates at 1m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	-33.722	metre
Y-axis translation(ty)	153.789	metre
Z-axis translation(tz)	94.959	metre
X-axis rotation(rx)	8.581	arc-second
Y-axis rotation(ry)	4.478	arc-second
Z-axis rotation(rz)	-4.54	arc-second
Scale difference(ds)	8.95	parts per million

Derived at 4 stations, tested at a further 9. Also used as tfm to JAD69 to JAD2001 (see code 15926). Note: Info source paper contains an error in sign of dS, subsequently confirmed by primary author and NLA of Jamaica, and corrected in this record.

JAD69 to WGS 84 (2)

EPSG:1085±2 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Jamaica - onshore
Scope:: Transformation of coordinates at 2m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	65.334	metre
Y-axis translation(ty)	212.46	metre
Z-axis translation(tz)	387.63	metre

Derived at 4 stations, tested at a further 9.

JAD69 to WGS 84 (1)

EPSG:1084±5 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Jamaica - onshore
Scope:: Transformation of coordinates at 5m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	70	metre
Y-axis translation(ty)	207	metre
Z-axis translation(tz)	389.5	metre

Derived via NAD27 and WGS 72. Preliminary values derived by Survey Department but not officially promulgated.

Convert EPSG:4242 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4242", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4242 — JAD69

geographic system using latitude and longitude on an ellipsoid · Area of use: Jamaica - onshore

+proj=longlat +ellps=clrk66 +no_defs +type=crs

More about EPSG:4242 →

Target: EPSG:4326 — WGS 84

geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)

+proj=longlat +datum=WGS84 +no_defs +type=crs

More about EPSG:4326 →

Frequently asked questions

How accurate is converting JAD69 to WGS 84?: The most accurate official EPSG transformation between these systems is accurate to about ±1 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official 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.

Need the reverse? Convert EPSG:4326 to EPSG:4242 →