The only thing the 'log' could do was compute speed according to propellor revs. It couldn't account for currents, which could move you forward, backward and sideways without your ever knowing it. Sun and star sightings had to be taken every day. In overcast weather it was quite easy to find yourself many miles off course. The longer the bad weather lasted the more 'off course' you would get.
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“Never do anything you can't take back.”
—Rocky Russo
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