Nav Mode:
There is a small line under the compass degree on the HUD compass for the Direction Track for your next waypoint, and the Line is for left or right of the course programmed for the navigation for the mission. If line is left of center, turn left to intercept. If right, turn right to intercept. As well, the HSI and the Compass in the console will tell you the same. The HSI will also tell you if you are above or below the assigned altitude for the nav waypoint. If the horizontal bar is high, you need to climb. If it's low, need to descend. This is what the autopilot for nav mode follows.