Whereas numerous tomes of comprehensive studies of navigation and
related subjects are readily available for the professional
navigator, there is dearth of publications suitable for the amateur
navigator in a how-to form. Furthermore, the appearance of
relatively inexpensive electronic devices, such as the GPS, has
lured would-be navigators away from the traditional methods of
navigation, in spite of the warnings offered by the companies
producing these devices. Thus they overlook the sine qua non of
good navigation, the determination of the current velocity, that is
the set and drift. Once determined this component of the
navigational triangle makes precise navigation a snap, whereas
without it there is only uncertainty. of basic formulae employing
basic trigonometry and later spherical trigonometry, methods which
have evolved over the centuries from the beginning of the Age of
Exploration in the early 1400's to modern days. In this text we
develop the knowledge and application of these mathematical
processes in such a way as to reassure the student that these
techniques are not beyond his capabilities.
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