Chart for Feb. includes data on wind velocities at Canal Zone, chart for May includes storm signal system in use in China Sea, and chart for Dec. includes navigation signal system used in Dutch East Indies.
Monthly weather chart of Indian Ocean showing isotherms and isobars, shipping routes, fog occurrence, radio telegraph stations, storm tracks and dates, shipwrecks, drift of derelict ships, and prevailing winds and currents, by ocean. Charts also include narrative review of weather conditions, and key to weather symbols and other information for navigators.