The recently released Version 3.2 of my GCS FlightZoomer offers an automatic approach system, that is similar to the ILS for manned aviation. For plane it was working since last year but since copters can't just slip down the glideslope and then touch down with a lot of forward speed, the implemented procedure had to be changed as follows for copter:
❶ At first, Copters will stay in GUIDED mode and will descend on the glideslope towards the runway.
❷ The moment, when an altitude of 7m above ground will be reached, the descend will stop and the copter will continue in level flight until the begin of the runway is reached.
❸ At that point, forward speed will be cut to zero, and FlightZoomer will put the flight controller automatically in LAND mode.
❹ The ArduCopter LAND mode will then simply perform a straight down descend.
As you can see in the examples in the video (towards the end), the whole procedure works nicely and supports rather fast descends.
For what purpose could ILS approaches for copters be useful?
More details can be found in the FlightZoomer User documentation: