Map shows southern and northern routes across the Atlantic Ocean between Europe and North America with coordinates of points along routes. Includes text, tables, compass, "Proposed New York-Gibraltar steamship routes," "Table of distances in nautical miles, from New York and Boston to Fastnet and Bishops Rock," "Latitudes of Great Circle Intersections on the Porposed Routes," and "Proposed Steamship Routes between New York and the Straits of Gibraltar." Also includes detailed navigational instructions for sailing from New York and Boston to Ireland and the Straits of Gibraltar. Scale not given.