William Clark Russell 
Death Ship, A Strange Story, Vol.2 (of 3) 

Excerpt: "A half-hour passed, and during that time I had sufficiently recovered from the distressful croak of the parrot to wonder, as any sailor would, how the ship was navigated; for I could not doubt that the clock kept pretty close to the true time, since the easting and westing made by the ship was small, never, perhaps, exceeding ten degrees; and the circumstance of noon having struck set me wondering in what fashion the captain and mates navigated the ship, whether they used the cross-staff or relied on dead reckoning, or were supernaturally conned."