DEPOT GENERAL DE LA MARINE - Plan de la rade de Macao (chine) Levé d'après les ordres mr. Rocquemaurel

Very detailed chart of Macao and several of the surrounding Islands, and features numerous depth soundings throughout. Prepared by captain, Gaston de Rocquemaurel. Logo of the "Dépôt Général de la Marine" in the upper left corner.
Captain, Gaston de Rocquemaurel, who had been second in command to Dumont d'Urville in his South Sea Expedition, 1837-1840, and who was responsible for the Port d'hong Kong inscription.
He led the corvette "la Capricieuse" to the South Seas (1851–1854).
Officially, it was a political mission to China, but Rocquemaurel also had some scientific assignments. He explored unknown parts of the Sea of Japan, reconnoitered the coasts of Indochina, and, by following Lapérouse’s route along the coasts of Korea and Kamchatka, he filled in some of the last uncharted areas on 18th-century maps.
This makes him the last in the line of what we call in French “les marins-savants” — literally “naval scholars,” who, from Bougainville to Dumont d’Urville, improved European knowledge of lands, peoples, and cultures of the Pacific Ocean.