hydrographic surveys and drawing beach charts were a snap in comparison.
In searching for sunken vessels two boats are used, of the same general type as the "hydrographic submarine."
“hydrographic Notices, Pacific Ocean,” 1856 to 1873 (p. 106).
The British admiralty charts are compiled, drawn and issued by the hydrographic office.
The hydrographic feature of greatest importance is the Humboldt Current.
In this work the British hydrographic office may justly claim the credit of having contributed the chief share.
To establish this fact will be to solve the last problem of the hydrographic system of Africa.
On the 17th April the Nadiejeda weighed anchor, and began a hydrographic survey, which had the best results.
Out of this giants missile the Italian authorities have made them a geodetic survey and hydrographic station.
The originals of these surveys form part of the most precious possessions of the hydrographic Office of the Admiralty.