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To perform fuel planning operations:
1. Press
C
and use
O
to highlight ‘Fuel Plan?’. Press
E
.
2. Use
K
to select either ‘wpt’ for direct navigation or the route number you would like to use.
3. For direct-to navigation, use
K
and
O
enter the ‘to’ and ‘from’ waypoints. Press
E
to accept the waypoints (to use your present position as a waypoint, leave the
corresponding waypoint field blank).
4. For route calculations, choose either ‘cum’ for cumulative route fuel requirements
(from beginning to end) or the leg desired by rotating
K
K
.
If leg is selected, it displays the amount of fuel required to fly until that leg is complete.
For example: The fuel required to complete leg 2 is leg 1 + leg 2.
Fuel required to complete leg 4 is leg 1 + leg 2 + leg 3 + leg 4.
5. Rotate
O
to advance the cursor to ‘fob:’ or ‘gs:’ (depending on which is displayed).
6. Use
K
and
O
to enter the fuel on board or the ground speed. Press
E
.
7. Rotate
O
back two positions to highlight the ‘fob:’ or ‘gs:’ field again.
9. Rotate
K
to display the other information. Press
E
.
10. Use
K
and
O
to enter the remaining data. Press
E
.
11. Use
K
and
O
to enter the flow rate, in units per hour, if needed. Press
E
.
The GPS 155 will calculate the range (distance) and endurance (how long the fuel
will last) of your aircraft. These are found in the first field on the bottom row of the
page. The fuel left on board (lfob) and reserve after the selected direct-to, leg or route
will also be displayed in the second field on the bottom row.
15
NAV KEY
NAV Menu 1/Fuel Planning
Fuel planning with endurance and leftover fuel on
board displayed.
Enter initial fuel on board before takeoff.
Fuel planning with range and reserve displayed.
155man (GOOD) 7/24/98 1:56 PM Page 15