Highly detailed Imray Sea Chart of Puerto Rico and the Virgin Islands, with 6 large insets.
The insets include San Juan, St. Thomas, the Southeast Part of Culebra, Christianstaed, Mayaguez, Guanica, Mona Island, Sombrero Island, Road Harbor and Gorda Sound. The map is very rare, but seems to have been and earlier edition of the base map referenced in Imray & Sons, Sailing directions for Puerto Rico and the Virgin Islands, compiled from recent surveys . . . published in 1879.
The map includes thousands of soundings and minute navigationaly details, place names, lighthouses (in yellow), sailing directions, etc. One of the most detailed commercial sea charts of the period.