.  
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.
Copyright . The Boeing Company. See title page for details.
11.31.12   June 6, 2003

Flight Management, Navigation -Flight Management System Operation
737 Operations Manual
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:
.  
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
intercept

.  
()I – ILS

Examples: CI32R, PV15, FN24L.
.  
( )L – localizer only

.  
( )B – backcourse ILS

.  
( )D – VOR/DME

.  
( )V – VOR only

.  
( )S – VOR with DME points

.  
()N – NDB

.  
( )Q – NDB with DME points

.  
()M – MLS

.  
( )T – Tacan

.  
( )R – RNAV.

Unnamed turn points – unnamed turn points that are part of a procedure are identified as a latitude and longitude waypoint. These include waypoints (except conditional waypoints) defined by flying a course or track from a waypoint (except conditional waypoints) to a radial or DME distance. These waypoints are automatically entered in a route by selection of a procedure using these waypoints, from the departures or arrivals page.
Airport reference points – airport reference points are identified by the ICAO identifier.
Duplicate Waypoint Names
Duplicate identifiers – should application of these rules result in more than one waypoint having the same identifier, then a CDU page change occurs when an attempt is made to enter the duplicated identifier.
The page title is SELECT DESIRED WPT. The page lists the latitude and longitude of waypoints with the same identifier and the type of facility or waypoint. Selecting the latitude/longitude of the desired
waypoint enters the correct waypoint on the original page. See chapter 11, section 42, “Select Desired Waypoint Page” for additional information. When a waypoint identifier is listed in the route more than once, certain route
modifications (such as DIRECT TO or HOLD) use the first occurrence of the waypoint even if the second occurrence is selected. If a new waypoint entry is attempted that has the same identifier as a waypoint already in the route, the SELECT DESIRED WPT page will not be displayed and the first waypoint will be used. To use the second occurrence waypoint, the first occurrence waypoint must be deleted from the route.
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December 3, 2004   11.31.13
Flight Management, Navigation -Flight Management System Operation 737 Operations Manual

Conditional Waypoint Names
Conditional waypoints are automatically entered into a route as a result of selecting a procedure on a DEPARTURES or ARRIVALS page. Normally, conditional waypoints cannot be manually entered on a RTE or RTE LEGS page. These waypoints are events when a condition occurs and are not at a geographically–fixed position. The types of conditions are:
.  
passing through an altitude . intercepting a course

.  
flying a heading to a radial or . heading vector to a course or
DME distance fix.

Altitude and course intercept conditional waypoints are displayed on the CDU inside (parentheses) marks. The following diagram depicts conditional waypoints.

HDG TO BCD
Note: All waypoints except BCD and CDE are examples of conditional waypoints.
Note:  On airplanes with U10, when (VECTOR) is the active leg and LNAV is not engaged, the FMC automatically sequence to the next waypoint when within 3 nm of the next leg. If (VECTOR) is the active waypoint and LNAV is engaged, the FMC does not automatically sequence to the next waypoint. The next waypoint becomes active only upon EXECution of the procedures for Proceeding Direct To a Waypoint or Intercepting a Leg to a Waypoint.
Copyright . The Boeing Company. See title page for details.
11.31.14   June 4, 2004
　
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