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The CPA function calculates the closest distance that a route will pass to a refer-
ence waypoint, and helps you create new route waypoints referencing a NAVAID.
To calculate the closest point of approach (CPA) from the route catalog page:
1. Use
K
to display the route you would like to use for the CPA function. The route must
consist of at least two waypoints, and the reference facility must fall between the way-
points of a route leg.
2. Press
C
twice and rotate
K
to select ‘cpa?’. Press
E
.
3. Use
K
and
O
to enter the identifier of the reference waypoint.
4. Press
E
. The bearing and distance of the closest point on the route will be displayed.
5. Press
E
to add the cpa waypoint to the route, or
\
to finish. If you do add the cpa
waypoint to the route, it will be named based on the reference waypoint plus a number (0-
9) appended to the end (e.g., KMCI3 for KMCI). If the waypoint does not fall between way-
points on the route, the reference waypoint does not exist or a unique name cannot be
assigned to the CPA waypoint, you’ll be informed with an ‘Invald CPA wpt ____’ message.
65
APPENDIX A
Navigation Units
Calculating Closest Point of Approach.
Closest Point of Approach
NORTH
TXK
KDAL
KLIT
TXKO
327°
26.7 nm
SECTION
5
ROUTES
Closest Point
of Approach
300 7/14/98 8:50 AM Page 65