Origins and Primary Areas of Navigation, Continued
How is this accomplished? Measurements are taken of the height above
the horizon of a celestial body. The measurement or sight, as it is
commonly referred to, is then reduced by a mathematical procedure.
The results are then plotted on the chart to determine position (fig. 1-2).
Celestial navigation will be covered in greater detail in chapters 6 and 9.
Radionavigation may be defined as the determination of position by the
use of radio waves. There are several types of systems in use today.
From the now seldom used Radio Direction Finder (RDF) to the latest
satellite navigation system, what they all have in common is that they
use radio waves. This area of navigation is now sometimes referred to
as electronic navigation.
This subject matter will be covered in greater
detail in chapter 8.
Figure 1-2. Sextant angle and sample 3 star fix.