1. VOR/DME RNAV
AST 241 Chapter 5

2. VOR'
Following VOR (Victor) airways on average results in 7 percent greater distance traveled point to point
VOR/DME RNAV developed in the late 1960’s to alleviate this problem

3. RNAV Theory
Course Line Computer (CLC)- takes VOR DME input and creates “phantom” waypoints in a straight line between any two points within range of the associated VOR’s

4. RNAV Theory Waypoints can be entered either of two ways:
Radial/Distance- Most Common, p.92 in text
Lat./Long.
Some units can hold 50 to 100 waypoints along different routes

5. RNAV Theory RNAV course- called a “desired track”
CDI sensitivity changes from enroute mode- one dot deflection = 1NM off course to approach mode- one dot deflection = a fraction of a mile (varies)
With RNAV the CDI sensitivity dosen’t change with distance from the waypoint- remains constant

6. RNAV Applications- VFR
Airport Finder
Random routings
Descent manager

7. RNAV Applications- IFR
Direct routes- easier to get once airborne- can ask for an initial on course heading from ATC
File /R on flight plan (usually)
Must be in RADAR contact for IFR nav.
No formal RNAV routing system in use today
At least one waypoint every 200 NM

8. RNAV-IFR (ctn.) Unit must meet AC 90-45
Use standard arrival and dep. Routings
Use at least one route defining waypoint per ARTCC boundary and one no farther than the previous center boundary
Must circumnavigate restricted airspace by at least 3 NM
Flight above FL 390 must lat./long. wpts.

9. RNAV- IFR (ctn.)
To find intersections- simply input the intersection as a waypoint and navigate direct to
Helpful to navigate along NDB airways and as a route cross-check along a Victor airway

10. RNAV Future
Will be around for as long as the VHF airway system is in use F(at least until the year 2010).
After that- ?