CHC Australia have 4 s-76a++'s that have four axis autopilot system in them. They use doppler and accelarometers as well as rad alt to keep the acft on station. The acft will home in on a becon or radar fix, when you fly overhead you press the magic button and it will comput a circuit to bring the acft to a hover at a hieght you dial in, with the target at you 1 o'clock about 50m. All of this is done on auto pilot. the crewman can then fly the acft from the back to the target using a button on the winch pendant. All damned cool stuff.
