Enroute High Altitude Charts

T-45C TS INav-01

Review of FLIP and FAA Publications

ENROUTE HIGH ALTITUDE CHARTS

Application

Jet routes, unlike low altitude airways, have no

defined width. Their centerlines terminate at the

outer edges of the NAVAID compass roses. A

jet route extending through a compass rose

around a NAVAID indicates the NAVAID is not

part of that jet route. It is not used for navigation

along the penetrating jet route and would not be

indicated in the route-of-flight section of your

flight plan unless you were filing “Direct” to that

NAVAID. For a NAVAID to be part of a jet route

segment, there must be a course depicted on

both sides of the compass rose, or the route terminates at the compass rose.

NOTE: The compass rose is oriented to magnetic north of the NAVAID which may not be adjusted to the

charted isogonic values.

To ensure all pilots fly the centerline of jet routes and achieve maximum navigational signal reception,

three types of definite changeover points (COPs) are prescribed by FAR Part 95 where pilots should

change VOR frequencies and/or TACAN channels and reset their course selectors to the inbound course

for the next NAVAID along each route segment.

1. On a relatively straight leg, change halfway, which is the point of equal signal strength; or,

2. Where the route takes a significant turn, change at the point of turn, which is the DME position

depicted by the symbol

or a dogleg at an intersection on the

chart

; or,

3. If the point of equal signal strength is not halfway, at the designated VORTAC changeover point along

the route depicted on the chart by the symbol

While proceeding on the en route portion of your flight, you will be directed to change Air Route Traffic

Control Center (ARTCC) frequencies as you proceed from sector to sector and from Center to Center

areas of responsibility. The boundaries for ARTCC areas of control responsibility are depicted on charts

FORT WORTH

by the symbol:

HOUSTON

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