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7`32. W1 22`18.5
7`32.4 W122`18.6
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0 . 0 8 I P D X SEA
IRS
FMC/GPS System ACTUAL
ACTUAL 5.11NM
ACTUAL Navigation Performance
0.08NM
000`/0.0
150`/3.7NM
(FMC/GPS)
IRS
Navigation Systems
BRG/DIST
October 1, 2000
747 Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.31.11
Actual Navigation Performance
Actual navigation performance (ANP) is the FMC current computed position
accuracy. It is titled ACTUAL and displays on the POS REF page 2 for the
navigation system displayed in title line 1. ACTUAL navigation performance is a
circular prediction centered at the FMC position. Airplane position is estimated to
be within this ACTUAL navigation performance circle 95 percent of the time.
Required Navigation Performance
Required Navigation Performance (RNP) is the navigation accuracy required for
operation within a defined airspace. It is expressed in nautical miles. RNP values
have been published for areas of operation around the world. Operations in these
areas require on-board navigation systems to alert the flight crew if ANP exceeds
RNP. The FMC supplies a default RNP value for takeoff, en route, oceanic/remote,
terminal, and approach phases of flight. The flight crew may enter an RNP value,
when required. RNP is on POS REF page 2.
Lateral Navigation (LNAV)
LNAV normally provides great circle courses between waypoints making up the
active route. When an FMC database procedure is entered in the active route, the
FMC commands a heading, a track, or a DME arc to comply with the procedure.
Waypoints
Waypoint identifiers display on the CDU and navigation display.
The CDU message NOT IN DATABASE displays if a manually entered waypoint
identifier is not in the database. Waypoints can be entered as latitude/longitude,
place/bearing/distance, or place bearing/place bearing.
FMC–generated waypoints contain a maximum of five characters assigned
according to the following rules.
NavaidWaypoints
VHF – waypoints located at VHF navaids (VOR/DME/LOC) are identified by
one, two, three, or four character facility identifier. Example: Los Angeles
VORTAC – LAX.
NDB – waypoints located at NDBs are identified by use of the station identifier.
Example: FORT NELSON, CAN – YE.
Fix Waypoints
Waypoints located at fixes with names containing five or fewer characters are
identified by the name. Example: ALPHA.
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.31.12 D6-30151-425
Flight Management, Navigation -
Flight Management System
Operation
Long Waypoints
Waypoints with more than five characters are abbreviated using the following
rules sequentially until five characters remain:
• for double letters, one letter is deleted. Example: KIMMEL becomes
KIMEL.
• keep the first letter, first vowel, and last letter. Delete other vowels starting
from right to left. Example: BAILEY becomes BAILY
• the next rule abbreviates names even further. Apply the previous rule, then
delete consonants from right to left. Example: BRIDGEPORT becomes
BRIDGPRT then BRIDT
• fixes with multiword names use the first letter of the first word and
abbreviate the last word, using the above rules sequentially until a total of
five characters remain. Example: ROUGHROAD becomes RROAD
UnnamedWaypoints
When an unnamed turn point, intersection, or fix is collocated with a named
waypoint or navaid on a different route structure (such as low altitude routes or an
approach), the name or identifier of the collocated waypoint is used. Example:
Unnamed turn point on J2 between Lake Charles (LCH) and New Orleans (MSY)
VORTACs is coincidental with the Lafayette (LFT) low altitude VORTAC. LFT is
used as the identifier for the turn point.
Identifier codes for unnamed turn points not coincidental with named waypoints
are constructed from the identifier of a navaid serving the point and the distance
from the navaid to the point. If the distance is 99 nautical miles or less, the navaid
identifier is placed first, followed by the distance. If the distance is 100 nautical
miles or more, the last two digits are used and placed ahead of the navaid identifier.
Examples (NAVAID – DISTANCE – IDENT):
• INW– 18 – INW18
• CSN – 106 – 06CSN
　
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