737 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 11.31.13
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:
Procedure Arc Fix Waypoint Names
Unnamed terminal area fixes along a DME arc procedure – unnamed fixes along
a DME arc procedure are identified with the first character D. Characters 2
through 4 indicate the radial on which the fix lies. The last character indicates the
arc radius. The radius is expressed by a letter of the alphabet where A = 1 mile, B
= 2 miles, C = 3 miles, and so forth. Examples:
• EPH252°/24 = D252X
• EPH145°/24 = D145X
• GEG006°/20 = D006T.
An unnamed waypoint along a DME arc with a radius greater than 26 miles is
identified as an unnamed turn point that is not coincidental with a named
waypoint. Examples:
• CPR338°/29 = CPR29
• GEG079°/30 = GEG30.
When there are multiple unnamed waypoints along a DME arc with a radius
greater than 26 miles, the station identifier is reduced to two characters, followed
by the radius, and then a sequence character. Examples:
• CPR134°/29 = CP29A
• CPR190° /29 = CP29B
• CPR201°/29 = CP29C.
• 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.
September 15, 2016
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