.  
(U4 and on) POS SHIFT page – permits selection of preferred position
from a list of references

.  
RTE DATA page – displays progress data for each waypoint on the RTE
LEGS page. Displays wind data for cruise waypoints

.  
REF NAV DATA page – displays information about waypoints, navaids,
airports, or runways

.  
(U7 and on) LATERAL OFFSET page – permits selection of a route
offset

.  
FIX INFO page – displays information about waypoints, and can be used
to create new waypoints and fixes

.  
SELECT DESIRED WPT page – permits selection of the desired
waypoint from a list of duplicate named waypoints.

.  
(U7 and on) NAV STATUS page – displays information about available
navigation aids.

The only cruise mode automatic page changes are the transition from climb to cruise at the top of climb point and from cruise to descent at the top of descent point.
LNAV Modifications
This section presents the normal techniques for modifying the route. The modifications include:
.  
adding and deleting waypoints . linking discontinuities

.  
resequencing waypoints . intercepting a course.

Flight Management, Navigation -FMC Cruise 737 Operations Manual

RTE LEGS Page Modifications
When modifications are made to the RTE LEGS page, several automatic prompt or identifying features assist in managing and executing the modifications, such as:
.
ERASE

.
INTC CRS.

Adding Waypoints
A waypoint can be added to the route whenever necessary.
The new waypoint must first be placed into the CDU scratchpad. Existing

waypoints can be copied from a RTE LEGS page into the scratchpad by pushing
the line select key adjacent to the desired waypoint.
The new waypoint is then inserted into the route at the desired sequence point by

pushing the line select key adjacent to the desired location for the new waypoint.
Using the NEXT PAGE/PREV PAGE function keys to select the desired location
does not alter the CDU scratchpad. The new entry automatically links to the
preceding waypoint via a direct route. Placing the new waypoint into the active
waypoint line is a special case and is discussed under Intercept Course in this
section.

All new waypoints, except downpath waypoints, cause a route discontinuity
between the new waypoint and the following waypoint.

Note:  If the FMC NAV database contains a HOLD pattern at the FAF, executing a database approach with a procedure turn and then executing a HOLD at the same FAF, using any inbound course, may cause a discontinuity between the FAF and the procedure turn. If the discontinuity is removed, LNAV guidance is available to fly the approach from the published holding pattern. LNAV guidance is not available to fly the published procedure turn.
Copyright . The Boeing Company. See title page for details.
11.42.2   December 3, 2004

Flight Management, Navigation -FMC Cruise 737 Operations Manual

Page Title
When the page is modified, MOD appears in front of the title in reverse video. This means the route is now altered. The MOD title also shows that the modifications are not yet executed and can be removed using the ERASE prompt.

Modified Waypoint
EPH waypoint is entered into the route between BEEZR and ELN. This modification creates a route discontinuity.

Route Discontinuity
Box prompts indicates a break in the route structure and the ability to link the route by entering a route waypoint into the discontinuity box prompts.

ERASE
The ERASE prompt is displayed when the first modification is entered. The prompt remains on the page until the modifications are erased or executed. Selecting ERASE removes all modifications and restores all active data.

ROUTE DISCONTINUITY
Indicates that the route is not continuous. Distance to destination on the PROGRESS page is not correct.
Flight Management, Navigation -FMC Cruise 737 Operations Manual

Deleting Waypoints
Waypoints can be removed from the RTE LEGS page. There are two normal methods to remove a waypoint:
.  
delete the waypoint using the DEL function key (not possible for the
active waypoint and conditional waypoints)

.  
resequence the route by moving a down–route waypoint up in the
sequence and automatically removing all waypoints that are between.

During the deletion process, all of the route prior to the deletion point remains unchanged. Removing a waypoint using the DEL function key causes a route discontinuity to replace the deleted waypoint.
　
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