737 VNAV Approach Logic
How does the FMC choose the "first approach waypoint" when transitioning to approach logic? I find it is a bit random.
"The FMC transitions to “on approach” when the airplane is within:
• 2 NM of the first approach waypoint (including approach transitions
such as arcs and procedure turns), or
• 2000 feet of airport elevation, whichever occurs first."