. "Hydrographer of the Royal Navy" . . "Hydrographer of the Navy's" . "Hydrographers to the Admiralty Board" . . "Hydrographer of the Navy" . . . "Hydrographer to the British Admiralty" . . "Hydrographer to the Admiralty" . . . "Hydrographer of the Navy" . . "Royal Navy hydrographer officer" . . . "Hydrographer" . "hydrographer of the Royal Navy" . "Office of the Hydrographer of the Navy" . .