From 1871 to 1912, Pelorus Jack, a large porpoise, guided ships through the treacherous waters of French Pass, just off the coast of New Zealand. Prior to 1871 the unpredictable currents and jagged underwater rocks in the pass had been responsible for heavy losses of both ships and men...
Smith, John C N
"To Pelorus Jack,"
Sketch: Vol. 29
, Article 4.
Available at: http://lib.dr.iastate.edu/sketch/vol29/iss3/4