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During route navigation, it is sometimes desirable to navigate a specified distance
away from the ‘active leg’ to help avoid certain airspaces or regions or bad weather.
The GNC 300’s parallel track feature will automatically guide you along a selected
offset from the active leg (bearing and distance information will be to the waypoints
along the original course).
To use offset navigation, or parallel track:
1. Press
R
and use
O
to display the route catalog page.
2. Use
K
to display route 0 (parallel track can only be used on the active route).
3. Press
C
twice and use
O
to highlight the parallel track value field.
4. Use
K
and
O
to enter the desired distance and direction (R or L) from the course.
5. Press
E
to accept.
It is important to note that offset navigation is only available on route navigation,
not direct-to navigation. When offset navigation is activated, an ‘Offset nav in effect’
message will be displayed with the distance and direction noted on the route activa-
tion page for route 0. If you enter an offset which causes a leg to be reversed, you’ll be
informed with an ‘Ofst too big for rte’ message. If you change the active route in any
way or perform a direct-to, you’ll be informed with an ‘Offset nav cancelled’ message.
67
APPENDIX A
Map Datums
A
IR
P
L
A
N
E
DEPARTURE WAYPOINT
O
FFS
E
T
D
IS
TAN
C
E
ARRIVAL
WAYPOINT
Parallel Track
SECTION
5
ROUTES
Parallel Track
Offset Navigation
300 7/14/98 8:50 AM Page 67