I
know only the rudiments of navigation. There is a vast deal yet for
me to learn. On the Snark there is a score of fascinating books on
navigation waiting for me. There is the danger-angle of Lecky,
there is the line of Sumner, which, when you know least of all where
you are, shows most conclusively where you are, and where you are
not. There are dozens and dozens of methods of finding one's
location on the deep, and one can work years before he masters it
all in all its fineness.
Even in the little we did learn there were slips that accounted for
the apparently antic behaviour of the Snark. On Thursday, May 16,
for instance, the trade wind failed us. During the twenty-four
hours that ended Friday at noon, by dead reckoning we had not sailed
twenty miles. Yet here are our positions, at noon, for the two
days, worked out from our observations:
Thursday 20 degrees 57 minutes 9 seconds N
152 degrees 40 minutes 30 seconds W
Friday 21 degrees 15 minutes 33 seconds N
154 degrees 12 minutes W
The difference between the two positions was something like eighty
miles. Yet we knew we had not travelled twenty miles. Now our
figuring was all right. We went over it several times. What was
wrong was the observations we had taken. To take a correct
observation requires practice and skill, and especially so on a
small craft like the Snark.
