737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
MN-FLT-OH-201
11.31.13
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 Point Waypoint Names
Unnamed turn points, intersections and DME fixes – 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
• TCS – 89 – TCS89.
Unnamed flight information region (FIR), upper flight information region (UIR),
and controlled airspace reporting points – waypoints located at unnamed FIR,
UIR, and controlled airspace reporting points are identified by the three–letter
airspace type identification followed by a two–digit sequence number.
Unnamed oceanic control area reporting points – positions in the northern
hemisphere use the letters N and E, while positions 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
• S06° E110° becomes 06S10.
March 1, 2021
