Example image of eyePlorer eyePlorer map for 'John Maclear': 1838 1907 Admiral Cape Town Hydrography July 17 June 27 Niagara Royal Navy 1872 1876 Challenger expedition George Nares HMS Challenger (1858) Challenger Plateau New Zealand Oceanography Christmas Island Indian Ocean Maclear's Rat Christopher Wyvill Baltic Sea Black Sea Sevastopol Jeddah Red Sea China Station Lieutenant Taku Forts HMS Excellent (shore establishment) First Lieutenant Flagship Indies Commander Captain (Royal Navy) HMS Alert (1856) Strait of Magellan Flag officer Vice Admiral Royal Geographical Society Royal Meteorological Society Cape of Good Hope Thomas Maclear John Herschel Heart failure England Maclear