Topographic mapping.
Extended to Tobago as Naparima 1972. (Note: Naparima 1972 is not used in Trinidad).
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Naparima 1955", "ellipsoid": { "name": "International 1924", "semi_major_axis": 6378388, "inverse_flattening": 297 }, "scope": "Topographic mapping.", "area": "Trinidad and Tobago - Trinidad - onshore.", "bbox": { "south_latitude": 9.99, "west_longitude": -61.98, "north_latitude": 10.9, "east_longitude": -60.85 }, "id": { "authority": "EPSG", "code": 6158 } }