An offset waypoint is used in the same
manner as any other waypoint.
declination, if available, or it uses the
calculated magnetic variation of the parent
waypoint. All points defined by a VHF
airspace system are based on the VHF
navaid station declination. Since the
magnetic variation and station declination
may not be the same at a given navaid, the
position may differ.
An offset waypoint may be inserted in any
waypoint ident field. The offset waypoint is retained in
memory after system shutdown only if entered on a
stored flight plan.
1. Cursor Position over the desired
waypoint IDENT field.
More than one offset waypoint is allowed
from one parent, using *, *1, *A1, etc., as
2. Parent waypoint identifier Insert with
an * following the entry.
If field blinks, parent waypoint does not
exist in CDU memory or in database and
must be defined on a Flight Plan page.
3. ENTER key Press.
4. Desired radial Insert.
5. ENTER key Press.
6. Desired distance Insert (nautical
miles and tenths of a nautical mile,
7. ENTER key Press.
9. ENTER key Press.
z. Database Update Procedures.
1. Aircraft power Apply.
2. Current database update card Insert into
3. ON Key Press to turn on system.
4. To update, perform the following.
If an interruption of the update process is
desired, remove the update disk. Do not
turn off the power to stop the update.
a. 1 key Press to select BEGIN
UPDATE, if required. If update is
not desired, press the 2 key to
restart the system.
Updating Database page appears
COMPLETE and the changing update
percentage appear indicating that the
update is in progress.
If update is successful:
ENTER key - Press to restart
navigation or turn system off.
If the database update fails, the error message
FAILED will be displayed. Press the 1 key to retry the
update or use the following procedure.
Sometimes when a retry is initiated, a
5. Update card Remove.
6. System Turn OFF.
7. Update card Re-insert into CDU.
8. System Turn ON and retry update using
9. If the update card is the wrong database
type, the message CARD INVALID will be
displayed. Press the 1 key to retry update
or use the following procedure.