5.8 Airway Entry
CAUTION:
The sequence of waypoints generated for an airway
must be carefully verified before the flightplan is navigated.
The VFS101 is capable of automatically expanding airways. The entry
of an airway is valid only when there are one or more waypoints
already in the flightplan. If no waypoint has been selected, then the last
en-route waypoint in the active flightplan will be used as the waypoint
where the airway will be entered.
The process for entering an airway is:
1. Adjust the Primary GPS to display the active flightplan.
2. While the VAS is depressed, say the initial airway letter
identifier (e.g. “VICTOR” for Victor airways, “JULIET” for Jet
Routes, “TANGO” for T Routes, etc.), then spell the
remainder of the airway using the ICAO alphabet (for
example: “VICTOR FIFE ZERO”), then say “ENTER”.
3. If the VFS101 generates a beep indicating successful
recognition, verify the airway was correctly recognized by
looking at the title line. The line should show the entry
waypoint and airway name, followed by a question mark.
For example, if the entry waypoint was “BOS” and the airway
entered was “VICTOR THREE” then the display should read:
BOS -> V3 -> ?
4. Enter the waypoint to exit the airway using the ICAO spelling
alphabet, followed by the word “ENTER”. Listen for the beep
indicating successful recognition.
5. If this completes the flightplan, release the VAS, otherwise
continue entering waypoints.
6. Before navigating the flightplan, carefully verify that the airway
was correctly expanded by scrolling through the waypoints
using the manual GPS interface.
Releasing the VAS before an exit waypoint has been recognized will
terminate the airway entry. This is useful if an airway name is
recognized in error.
Note:
The Garmin GPS units are limited to 31 or 100 waypoints per
flightplan. Some airway routes may be too long to be fully expanded. If
such an entry is attempted the VFS101 will sound an error tone,
display a warning message (“TOO MANY WAYPOINTS”) on the title
line, and insert as many of the waypoints into the flightplan as possible.
Airway Compression (section 7.4) may be used to reduce the number
of waypoints in an airway expansion.
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