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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. The GPS 155’s
parallel track feature will automatically guide you along a selected offset from the
active leg.
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
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 leg.
5. Press
E
to accept.
It is important to note that offset navigation is only available on route navigation,
not direct-to navigation. Offset navigation is NOT valid for IFR approach procedures.
When offset navigation is activated, an ‘Offset nav in effect’ message will be displayed,
with the distance and direction noted on the route activation page for route 0. If you
enter an offset which causes a leg to be reversed, you’ll be informed with the message
‘Ofst too big for rte’. If you change the active route in any way, perform a direct-to, or
re-activate the route, you’ll be informed with an‘Offset nav cancelled’ message.
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DIRECT-TO & ROUTE NAV
Offset Navigation
Enter parallel track value after route activation.
A
IR
P
L
A
N
E
OFFSET
DISTANCE
DEPARTURE WAYPOINT
ARRIVAL
WAYPOINT
Parallel Track
155man (GOOD) 7/24/98 1:57 PM Page 56