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Convert Mhast (offshore) to WGS 84

Convert coordinates from Mhast (offshore) (EPSG:4705) to WGS 84 (EPSG:4326) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-4705-to-epsg-4326

Official EPSG transformation from Mhast (offshore) to WGS 84

The EPSG Geodetic Parameter Dataset defines 1 transformation between Mhast (offshore) (EPSG:4705) and WGS 84 (EPSG:4326). Its parameters, accuracy and area of use are listed below.

Mhast (offshore) to WGS 84 (1)

EPSG:8656±11 m
Method:
Concatenated operation
Area of use:
Africa - Angola (Cabinda) and DR Congo (Zaire) - offshore
Scope:
Oil and gas exploration and production.
  1. Mhast (offshore) to WGS 72BE (1) (null)
  2. WGS 72BE to WGS 84 (1) (null)

Derived via WGS 72BE. Can be implemented as a single position vector transformation with parameter values of dX = -255.0 m, dY = -29.0 m, dZ = -103.1 m, rX = rY = 0 sec, rZ = 0.814 sec, dS = -0.38 ppm.

Convert EPSG:4705 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4705", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4705 — Mhast (offshore)

geographic system using latitude and longitude on an ellipsoid · Area of use: Africa - Angola (Cabinda) and DR Congo (Zaire) - offshore

+proj=longlat +ellps=intl +no_defs +type=crs
More about EPSG:4705 →

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 Mhast (offshore) to WGS 84?
The most accurate official EPSG transformation between these systems is accurate to about ±11 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:4705 →