Even in describing the elementary nautical operations which such boats
require, it is necessary to lay down a position for the HARBOUR,
direction for the WIND, and trip for the VESSEL.
Let us suppose, then, that the mouth of the harbour lies towards the
south; that the wind blows from the north, with a little inclination
to east, and that we wish first to sail due south to get out of the
harbour, next direct our course eastward, then return westward till we
get abreast the mouth of the harbour, and lastly, northward, to enter
the harbour and come to our moorings.
These courses will, with variations in the force of the wind,
illustrate every common and useful manœuvre.