Chapter III · Soundings & Hazards
Plate 7

Key Finding

Soundings we trusted concealed the greatest hazards

Passage correction rate upon re-survey · percentage revealing chart discrepancies, 1822–1847

Mean · 53% 78% 71% 62% 45% 34% 29% Torres Strait Cape Horn Malacca Suez Approach Eng. Channel Bay of Biscay % 100 75 50 25 0

Based on 247 passage re-surveys conducted by the Pelagic Survey Office

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