In X-Plane's -Settings -Data Output window,
set the IP Address to 127.0.0.1, set the Port to 49001, and check the 'Send network data' box.
127.0.0.1 refers the computer in use and 49001 is the common port between X-Plane and XPlaneNetworkData.
Check Network via UDP boxes on line numbers 3, 17, and 20 for this program to receive Speed, Heading, and Altitude.
When you run X-Plane, this program will show those outputs in a small window that can be moved and overlay X-Plane.
(it can disappear for several reasons, but can be put back by pressing Alt-Tab)

To see bearing and distance to a destination, create a file in Notepad named Destinations.txt and put it in the same folder as this program.
In that file, write a destination name followed by the lat/lon for it that was copied from AirNav.com (use Windows copy and paste).
Example:
Palo Alto 37.4611111,-122.1150556
Castle 37.3804844,-120.5681864
*Mariposa 37.5108611,-120.0395278
Moffett 37.4161422,-122.049131
San Jose 37.3629947,-121.9286206
Reid Hillview 37.3328611,-121.8198056
The * in front of Mariposa causes XPlaneNetworkData to use that lat/lon for its destination.
This program calculates instantaneous heading and distance from X-Plane between where you are and a selected destination,
and puts both heading and distance to the destination in the window below your speed, heading, and altitude.
(this program reads the first character in that file, and if it's k (for knots), then speed in knots will be shown,
otherwise speed in mph will be shown; without a Destinations.txt, the default is knots (in the example, P is the first character))

You could change your destination to anywhere on a final approach.
In Destinations.txt, put the distance and then TRUE bearing from the airport to that final fix at the end of the airport's lat/lon.
Example:
*ReidHillview 37.3328611,-121.8198056 5.25 323
With data from AirNav, the final fix will be 5.25 miles from the airport at 323 degrees TRUE (to land on runway 13).
When you get within 1 mile of the final fix, bearing and distance change to the airport bearing and distance.
You'll only see magnetic headings/bearings because this program changes to them after computations have been made.

You could create a simulated ILS.
In Destinations.txt, first REPLACE the latitude,longitude you already entered with runway threshold lat/lon from AirNav
(in the exact same format -- therefore, you'll have to change AirNav's runway threshold Lat/Lon format by dividing the 
minutes of Latitude and Longitude by 60.0 (floating point division), and adding that to the degree of Latitude or Longitude).
Then (after the distance from airport and bearing to that final fix) add the MAGNETIC runway heading
and then the runway elevation at the runway threshold (again from AirNav).
(in AirNav, W or S means make the number negative, and E or N means the number is positive)
Example:
*ReidHillview 37.336513,-121.822602 5.25 307 127 124
(remember the final fix bearing is true, and runway heading is magnetic (elevation is 124 feet above sea level))
When you're within 1 mile of the final fix, on the second line of XPlaneNetworkData's window
you'll see a computed heading to fly to intercept final heading,
and the glide slope angle you're on to land 1,000ft past the threshold (3 degrees is standard).
At 200 feet above threshold elevation (minimums), ILS info will disappear so you can land visually.
If you press your computer's spacebar, ILS info will be replaced with bearing and distance to the threshold.
Pressing the spacebar again will show the heading to fly and your glide slope.