Great Britain. Directorate of Overseas Surveys. United Kingdom. Ministry of Overseas Development (Directorate of Overseas Surveys) North Decimal Degree 18.500000. South Decimal Degree 18.2500. East Decimal Degree -88.5000. West Decimal Degree -88.7500. Alternate title: Belize with part of Mexico. Standard map series designation: Series E755 (D.O.S. 4499). Transverse Mercator projection. U.T.M. zone 16 grid. Relief shown by 20 m. contour interval and spot heights.