Great Britain. Ministry of Overseas Development (Directorate of Overseas Surveys) Great Britain. Directorate of Overseas Surveys. North Decimal Degree 16.750000. South Decimal Degree 16.5000. East Decimal Degree -89.0000. West Decimal Degree -89.2500. Standard map series designation: D.O.S. 4499 (series E755). Transverse Mercator projection. Grid: U.T.M. zone 16. Relief shown by 20 m. contour interval, shading and spot heights.