Integrated Approach Navigation. A way of flying an NPA with lateral and vertical guidance. Like FINAL APP in the Airbus.
Lateral mode is “FAC” (Final Approach Course);
Vertical mode is “GP” (Glide Path).
Provided that the final approach (from the FAF to the MAPt) is a straight line, we can use IAN by loading the approach from the FMC and using the “LOC/FAC” button on the MCP to capture the FAC, then the “APP” button to capture the GP.
The PFD/HUD displays pointers (triangles) to show FAC and GP deviations, like an ILS (which uses diamond-shaped deviation pointers).
For a LOC only approach, you can use “LOC” and “GP”, instead of “FAC” and “GP”.
In that case the lateral pointer will be a diamond and the vertical pointer will be a triangle.