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The GNC 250XL’s search and rescue function provides navigation guidance for
search and rescue operations, navigating in a ladder pattern to maximize coverage and
efficiency. This is done in reference to two waypoints called ‘anchor waypoints’. The
first leg will be a specified distance from the line connecting the anchor waypoints.
This is called the ‘offset distance’. The ‘increment distance’ is the distance between each
subsequent leg. The ladder can be created on either side of the anchor waypoints.
To perform a search and rescue operation:
1. Create a route of only two waypoints.
2. Press
R
and use
O
to display the route catalog page.
3. Use
K
to select the 2-waypoint route.
4. Press
C
twice and use
K
to display ‘search?’. Press
E
.
5. Use
K
and
O
to enter the leg increment value and R or L. Press
E
.
6. Rotate
O
to highlight the initial offset, and use
K
and
O
to enter the initial offset
value, and R or L.
7. Press
E
three times to accept the operation values and begin navigation.
After activating a search and rescue, you will be informed with an ‘Offset nav in
effect’ message each time you traverse the route offset from the anchor waypoints and
the CDI page will guide you along each leg of the ladder pattern. Note that bearing
and distance information are referenced to the anchor waypoints. Once you’ve arrived
at the destination waypoint, the leg increment will be added to your present offset, and
the route will be automatically reversed. If a search and rescue is interrupted, note the
parallel track direction (R or L) and distance on the catalog page for route 0. When
you resume search and rescue operations, use this as the initial offset.
69
Performing a search and rescue operation.
SECTION
5
ROUTES
Search & Rescue
Operations
The map page will show the active leg of the
search and rescue pattern as a solid line with the
anchor waypoints joined together by a dashed line.
250xl manual 2 7/17/98 1:28 PM Page 69