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normally provides great circle courses between waypoints. However, when an
arrival or approach from the FMC database is entered into the active route, the
FMC commands a heading, track, or a DME arc to comply with the procedure.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary 11.31.11
Waypoints
Waypoint (navigation fix) identifiers display on the CDU and navigation display.
The CDU message NOT IN DATABASE displays if a manually entered waypoint
identifier is not kept in the database. The waypoint can still be entered as a
latitude/longitude, place–bearing/distance or place–bearing/place–bearing
waypoint.
FMC–generated waypoints contain a maximum of five characters assigned
according to the following rules:
Navaid Waypoints
VHF – waypoints located at VHF navaids (VOR/DME/LOC) are identified by
one, two, three or four character facility identifier. Examples:
• Los Angeles VORTAC – LAX
• Tyndall TACAN – PAM
• Riga Engure, USSR – AN
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. Examples:
• DOT
• ACRA
• ALPHA
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
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.12 Boeing Proprietary
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.
Examples:
• CLEAR LAKE becomes CLAKE
• ROUGH ROAD becomes RROAD
Unnamed Waypoints
If 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 the 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
Waypoint located at unnamed flight information region (FIR), upper flight
information region (UIR), and controlled airspace reporting points are identified
by the three–letter airspace type identification followed by a two–digit sequence
number. Example:
• FRA01
Unnamed oceanic control area reporting points in the northern hemisphere use the
letters N and E, while points in the southern hemisphere use the letters S and W.
Latitude always precedes longitude. For longitude, only the last two digits of the
three digit value are used.
Placement of the designator in the five character set indicates whether the first
longitude digit is 0 or 1. The letter is the last character if the longitude is less than
100° and is the third character if the longitude is 100° or greater.
N is used for north latitude, west longitude. E is used for north latitude, east
longitude. S is used for south latitude, east longitude. W is used for south latitude,
west longitude. Examples:
• N50° W040° becomes 5040N
• N75° W170° becomes 75N70
• N50° E020° becomes 5020E
• N06° E110° becomes 06E10
• S52° W075° becomes 5275W
• S07° W120° becomes 07W20
• S50° E020° becomes 5020S
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787机组操作手册Flight Crew Operations Manual 3(25)
