The slightly different physical location of a backup antenna would produce Lines of Position different from those of the primary antenna.
12.
The first is to obtain a line of position by use of a sextant observation and the techniques of celestial navigation.
13.
The search locations were derived from the line of position ( 157 337 ) broadcast by Earhart on July 2, 1937.
14.
The last step in the process is to plot the lines of position " LOP " and determine the vessel's location.
15.
In theory, this level of accuracy could give a line of position within a nautical mile of the navigator's actual position.
16.
If only one line of position is available, this may be evaluated against the Dead reckoning position to establish an estimated position.
17.
If observations are taken at short intervals, a few minutes at most, the corrected lines of position by convention yield a " fix ".
18.
Note that the lines of position in the figure are distorted because of the map s projection; they would be circular if plotted on a globe.
19.
The sun can also be used by itself to shoot a succession of lines of position ( best done around local noon ) to determine a position.
20.
Two or more bearings to mapped, known points are taken; their resultant lines of position drawn from those points to where they intersect will reveal the navigator's location.
