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Calculating closest point of approach.
SECTION
5
ROUTES
Copying Routes
CPA Function
Closest point of approach to ‘TXK’.
The route action field also features a copy function that permits you to copy any
route to another open storage route. The copy function can be used to save the con-
tents of the active route (route 0) to an open storage route.
To copy a route:
1. Press
R
and use
O
to display the route catalog page.
2. Use
K
to display the route to which you would like to copy to. The route must be empty.
3. Press
C
twice and rotate
K
to select ‘copy?’. Press
E
.
4. Use
K
to enter the route you would like to copy. The departure/arrival identifiers will be
displayed for your reference. Press
E
to copy the route.
The CPA function calculates the closest distance that a route will pass to a refer-
ence waypoint, and helps when creating new route waypoints referenced to 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
waypoints 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) added to the end (e.g., KMCI3 for KMCI). If the waypoint does not fall between waypoints
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 the ‘Invald CPA wpt ____’ message.
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250xl manual 2 7/17/98 1:28 PM Page 68