line.

Direct To/Intercept Leg To (On airplanes with a DIR INTC key)
Proceeding direct to a waypoint or intercepting a course to a waypoint may be accomplished by using the direct intercept (DIR INTC) mode select key. Pushing the DIR INTC key adds box prompt options to the bottom of the ACT RTE LEGS page.
Using line select or manual entry, the desired waypoint is entered into the scratchpad. The waypoint is then moved into the appropriate boxes.
Flight Management, Navigation -FMC Cruise 737 Operations Manual

DIRECT TO Boxes
Entering the desired waypoint in these boxes makes that waypoint the active waypoint and establishes a course direct to the waypoint.

Intercept Leg To (INTC LEG TO) Boxes
Entering the desired waypoint in these boxes makes that waypoint the active waypoint and allows an intercept course to be specified to the waypoint.

Scratchpad Entry
The desired waypoint is entered in the scratchpad, then line selected to the appropriate boxes.
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Flight Management, Navigation -FMC Cruise 737 Operations Manual
Direct To

Direct Course
Direct course from airplane position to entered waypoint.
Execute to proceed direct to active waypoint.

Flight Management, Navigation -FMC Cruise 737 Operations Manual

Intercept Leg To

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Flight Management, Navigation -FMC Cruise 737 Operations Manual

Intercept Course (INTC CRS)
A waypoint already in the route has an existing inbound course. When the waypoint is inserted into the INTC LEG TO box prompts, the waypoint becomes the modified active waypoint. The existing inbound course is displayed above the waypoint and (U3.1 and on) on the INTC CRS line in small font. Execution changes the MOD page to ACT.
After completing the desired modifications, the crew must ensure that LNAV is engaged to fly the intercept course. In order to engage LNAV, the airplane must be on an intercept heading to the course.

Crew Desired Intercept Course
The crew can select any inbound course to the active waypoint by first entering the course into the scratchpad.

Crew Selected Intercept Course
After entering a course into the scratchpad, selecting the INTC CRS line transfers the new course to the INTC CRS line and to the active waypoint.
Flight Management, Navigation -FMC Cruise

737 Operations Manual
After completing the desired modifications, the crew must ensure that LNAV is engaged to fly the intercept course. In order to engage LNAV, the airplane must be on an intercept heading to the course.

Intercept Course (INTC CRS)
A waypoint not already in the route is inserted into the INTC LEG TO box
prompts. It becomes the modified active waypoint, and the direct inbound course
is displayed above the waypoint. (U3.1 and on) Dashes are displayed on the INTC
CRS line in small font. (U3.0) Box prompts are displayed on the INTC CRS line.

Pilot entry of a course into the dashes replaces the direct course to the modified

active waypoint. Manual entries are displayed in large font.
After completing the desired modifications, the crew must ensure that LNAV is
engaged to fly the intercept course. In order to engage LNAV, the airplane must be
on an intercept heading to the course.

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Flight Management, Navigation -FMC Cruise 737 Operations Manual
Desired Waypoint/Offset Pages Select Desired Waypoint Page
When a waypoint identifier is not unique (other database waypoints have the same name), a selection of which latitude/longitude to use must be made before that waypoint can be used in the route.
The SELECT DESIRED WPT page is automatically displayed when the FMC encounters more than one identifier for the same waypoint name after a waypoint entry.

Identifier
Displays the identifier for the duplicate named waypoints. Select the proper
waypoint by pushing the appropriate left or right line select key. This page is
automatically removed after a waypoint is selected.

Frequency
Displays the frequency of the navaid.
Blank if the waypoint is not a navaid.

Latitude/Longitude
The latitude/longitude is displayed for each duplicate name.

Type
Shows type of navaid.
Flight Management, Navigation -FMC Cruise 737 Operations Manual

Blank if the waypoint is not a navaid.
Lateral Offset (U7 and on)
A lateral offset may be specified up to 99.9 nautical miles left or right of course. The OFFSET prompt is displayed on the INIT/REF INDEX page and in flight on the RTE page. Selection displays the MOD LATERAL OFFSET (or ACT LATERAL OFFSET page if an offset already exists).
　
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