Lines of Position

INSTRUMENT NAVIGATION

LINES OF POSITION

One definition of a fix is the intersection of two lines of position (LOP). An aircraft

equipped with two navigation sources (such as the T-34) can obtain two lines of position from

different navaids. The intersection of these lines will provide a fix. Although this will not be

your primary means of navigation, it is a backup and should be used when primary systems

have been degraded.

SUMMARY

TACAN's supply all the information you need to identify your geographic position. They

provide magnetic bearing and distance from the selected TACAN station. VOR's are quite

similar to TACANs in that magnetic bearing is provided; however, VORs are not equipped

with DME. Each of these navigation facilities generate radials which are numbered clockwise

from 001 to 360" and any aircraft tuned in to a particular navaid will find itself on one of

these radials.

2-12 NAVAID POSITIONING