Mezue ahịrịokwu na-esonụ: N'oge Rear-Admiral A Mostyn Ubi okwu dị ka Hydrographer na Admiralty Board, na Hydrographic Office gbazinyere ngwá ọrụ na
Njem njem Nimrod nke British Antarctic Expedition nke Ernest Shackleton duziri na 1907. Mgbe ụgbọ mmiri RMS bụ́ "Titanic" kpụchara n'afọ 1912, e hiwere òtù na-ahụ maka nchebe nke ndụ ndị mmadụ n'oké osimiri (SOLAS), e webatakwara usoro ịkọ akụkọ banyere ice na ịkọ ihe ga-eme n'ọdịnihu. N'oge Agha Iwa Mbụ, mgbe Rear-Admiral Sir John F Parry bụ Hydrographer nke Navy, Hydrographic Office mepụtara ọtụtụ eserese ọhụrụ na ngwaahịa iji kwado Royal Navy.