The second page available from the GNC 250’s WPT key is the
proximity way-
points page
. This page allows you to define an alarm circle around a selected waypoint
and is useful in defining alarm circles around towers or obstructions. Up to nine prox-
imity waypoints can be entered, with an alarm radius of up to 99.9 nm.
To create or edit a proximity waypoint:
1. Press
W
and use
O
to display the ‘Proximity waypoints’ page.
2. Press
C
twice and use
O
to highlight the first available field.
4. Use
K
and
O
to enter the identifier. It may be an airport, VOR, NDB, INT or user
waypoint. Press
E
.
5. Use
K
and
O
to enter the radius of the alarm circle. Press
E
.
If two proximity waypoints are entered and their regions overlap, you will be
informed with the message ‘Proximity overlap’. This message will be displayed each time
you turn on the GNC 250 for as long as the overlap remains.
Warning:
If you enter the
overlap area you will only be informed of the
nearest
proximity waypoint.
To remove a waypoint from the proximity waypoints page:
1. Press
C
twice, if necessary, to obtain a cursor in the GPS window.
2. Press
\
to erase the name, and then
E
to delete.
To scroll through the proximity waypoints list:
1. Rotate
K
with the flashing cursor inactive (or use
O
with the flashing cursor active) to
scroll through the available proximity waypoints. The scrolling arrow prompt will indicate the
direction to scroll to view additional waypoints, if available.
48
REFERENCE
Editing Routes
Proximity Waypoints Page
Proximity Alarm
SECTION
3
WPT KEY
Proximity Waypoints
250 real 7/14/98 9:32 AM Page 48
