What is the accuracy of an NDB providing track guidance assumed to be when constructing an instrument approach?
Refer to figure.
ICAO Doc 8168
SECTION 2 BASIC DESIGN CONCEPTS
2.1 ACCURACY OF FIXES
2.1.1.2 Because all navigation facilities and waypoints have accuracy limitations, the geographic point which is identified is not precise but may be anywhere within an area called the fix tolerance area which surrounds the plotted location of the facility, waypoint or intersection. Figure A-2-1 illustrates the fix tolerance area formed by the intersection of two radials or tracks from different navigation facilities.
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