The British Oceanographic Data Centre (BODC) is a national facility for maintaining and distributing data concerning the marine environment. They provide several web services for implementing this data, including the Marsden Square Translator Service, which is accessible using SOAP calls. Data is returned in XML format.
Marsden Squares are a tool for expressing spatial coordinates by dividing the Earth's surface into indexed squares. They are used primarily for identifying the geographic position of meteorological and oceanographic data. The BODC Marsden Square Translator Service allows users to input a list of Marsden Square references and calculate the geographical coordinates of the rectangular bounding box enclosing them.