Figure 16 is another example. You can not enter/exit J-70 at Spokane (GEG). The airway line
cuts through the compass rose and there are no radial designations for J-70 in the vicinity of
GEG. This indicates that Spokane is NOT part of J-70.
Let's turn our attention to intersections. The AIM (Airman's Information Manual) defines
A POINT DEFINED BY ANY COMBINATION OF COURSES, RADIALS OR
BEARINGS OF TWO OR MORE NAVIGATION AIDS.
Application of this definition to enroute charts has provided two types of intersection:
NAMED and UNNAMED. NOBEL is a "NAMED" intersection. (Figure 17)
RADIAL TRACKING AND COURSE CONTROL 3-11