Comores, Madagascar, Seychelles Group, La Reunion, Mauritius, Chagos Archipelago and other islands lying Westward of Longitude 90E.. Often referred to as Pilots, Sailing Directions are designed for use by the merchant mariner on all classes of ocean-going vessels with essential information on all aspects of navigation. Sailing Directions are complementary to Admiralty Standard Nautical Charts and provide worldwide coverage in 74 volumes. Each publication contains quality colour photography and views, as well as information on navigational hazards, buoyage, meteorological data, details of pilotage, regulations, port facilities and guides to major port entry. New Editions of Admiralty Sailing Directions are published on a regular basis. Navigationally significant information for these publications is issued via the Admiralty Notices to Mariners weekly bulletin (Section IV).