Oil and gas exploration and production.
Replaced Mhast (offshore) (code 6705) in 1987. Origin coordinates constrained to those of Mhast (offshore) but other station coordinates differ. References to "Mhast" since 1987 often should have stated "Malongo 1987".
Angola (Cabinda) - offshore; The Democratic Republic of the Congo (Zaire) - offshore.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Malongo 1987", "ellipsoid": { "name": "International 1924", "semi_major_axis": 6378388, "inverse_flattening": 297 }, "scope": "Oil and gas exploration and production.", "area": "Angola (Cabinda) - offshore; The Democratic Republic of the Congo (Zaire) - offshore.", "bbox": { "south_latitude": -6.04, "west_longitude": 10.53, "north_latitude": -5.05, "east_longitude": 12.37 }, "id": { "authority": "EPSG", "code": 6259 } }