The last character indicates the arc radius. Characters 2 through 4 indicate the radial on which the fix lies. Unnamed terminal area fixes along a DME arc procedure are identified with the first character D. W is used for south latitude, west longitude. S is used for south latitude, east longitude. E is used for north latitude, east longitude. N is used for north latitude, west longitude. 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. Placement of the designator in the five-character set indicates whether the first longitude digit is 0 or 1. For longitude, only the last two digits of the three-digit value are used. 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. 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. If the distance is 100 nautical miles or more, the last two digits are used and placed ahead of the navaid identifier. If the distance is 99 nautical miles or less, the navaid identifier is placed first, followed by the distance. 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. LFT is used as the identifier for the turn point. Unnamed turn point on J2 between the Lake Charles (LCH) and New Orleans (MSY) VORTACs is coincidental with the Lafayette (LFT) low altitude VORTAC.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:įixes 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. Apply the previous rule, then delete consonants from right to left. The next rule abbreviates names even further. Delete other vowels starting from right to left. Keep the first letter, first vowel and last letter. For double letters, one letter is deleted. Waypoints with more than five characters are abbreviated using the following rules sequentially until five characters remain. Waypoints located at fixes with names containing five or fewer characters are identified by the name. Waypoints located at NDBs are identified by use of the station identifier followed by "NB". Waypoints located at NDBs are identified by use of the station identifier. VHF - waypoints located at VHF navaids (VOR/DME/LOC) are identified by one, two, three or four character facility identifier. The waypoint can still be entered as a latitude/longitude, place-bearing/distance or a place-bearing/place-bearing waypoint.įMC-generated waypoints contain a maximum of five characters assigned according to the following rules. The CDU message NOT IN DATABASE is displayed if a manually entered waypoint identifier is not in the database. Waypoint (navigation fix) identifiers display on the CDU and HSI. 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. FMC LNAV guidance normally provides great circle courses between waypoints. When selected after takeoff, LNAV engages when laterally within 2.5 nautical miles of the active route leg. LNAV provides steering commands to the next waypoint or the selected route intercept point. General IRS Radio Navigation System FMS Description FMS Introduction FMS Operational Notes Terminology Navigation Position LNAV VNAV Data Entry FMC CDU Pages Alternate Navigation System Messages FCTM Flight Management Navigation.
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