Gnomonic Charts are used in passage planning to plot great circle routes as a straight line. They are useful for devising composite rhumb line courses. Fifteen charts cover the world at scales of 1:13,500,000 and 1:26,500,000.
Admiralty Routeing Charts are essential for use in passage planning for ocean voyages. Each chart documents prevailing weather patterns – wind, currents, wave heights, visibility, surface pressure, sea surface temperature, and ice caps for a given month of the year. They include routes and distances between major ports, ocean currents, ice limits, load lines and wind roses, with expected meteorological and oceanographic conditions for each month of the year. Five charts cover the oceans of the world; North Atlantic, South Atlantic, North Pacific, South Pacific and the Indian Ocean.