What is the datum/projection of St. Lucia, West Indies?
The projection and datum of St.Lucia, West Indies: The current classical geodetic datum for your country is “DOS 3 Lighthouse 1955” established by the Directorate of Overseas Surveys. (They are now part of the Ordnance Survey of Great Britain.) I do not have the coordinates of the origin or the azimuth of orientation, but the ellipsoid is the “Clarke 1880, (Modified)” where a = 6,378,249.145 meters, 1/f = 293.465. The associated Grid is the British West Indies “BWI Grid” that is based on the Gauss-Kruger Transverse Mercator projection with no special truncations. The Central Meridian is 62W, False Easting is 400 Km, scale factor at origin is reduced to 1/2000. Eastings for your country are always greater than 500 Km., the Northings are always greater than 1,500 Km. (That’s a lot of digits for your island!!) The “Vieux Fort” is an old Astro Datum known to exist, I think it’s now obsolete. It’s probably “T 1 1949”, which is a Tidal bench Mark in that town. The 1:50,000 mapping of your co
