.
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 . S52° W075° becomes 5275W

.
N75° W170° becomes 75N70 . S07° W120° becomes 07W20

.
N50° E020° becomes 5020E . S50° E020° becomes 5020S

.
N06° E110° becomes 06E10 . S06° E110° becomes 06S10.

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.

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September 27, 2004  11.31.13
Flight Management, Navigation -Flight Management System Operation 737 Flight Crew Operations Manual

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.

Procedure Fix Waypoint Names
Marker beacons – a marker beacon is identified by the marker type identifier followed by the runway number. Examples:
.
Outer Marker 13R = OM13R

.
Middle Marker 21 = MM21.

Runway–related fixes – waypoints located at unnamed runway–related fixes are identified by adding a two–letter prefix to the runway number. The following list is used to determine the appropriate prefix:
.
RX – runway extension fix .  BM – back course marker

.
FA – VFR final approach fix .  MD – minimum descent

.
CF – final approach course fix  altitude

.
FF – final approach fix .  A – (+ an alpha) step down fix

.
IF – initial approach fix .  RW – runway threshold

.
OM – outer marker  . MA – missed approach point
other than RW

.
MM – middle marker

. TD – touchdown point inboard

.
IM – inner marker

of RW.
Examples: OM25L, MM09, IM23, RW04, RW18L.
For airports with more than one approach to the same runway, the two letter prefix may change to allow different identifiers for the same waypoint. The first letter identifies the type of fix and the second letter identifies the type approach as follows:
Copyright . The Boeing Company. See title page for details.
11.31.14   September 27, 2004

Flight Management, Navigation -Flight Management System Operation
737 Flight Crew Operations Manual
.  
C( ) – final approach course fix

.  
F( ) – final approach fix

.  
P( ) – missed approach point

.  
I( ) – initial approach fix

.  
D( ) – minimum descent
altitude

.  
T( ) – touch down point

.  
R( ) – runway centerline
　
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