Polycon on-board communications (Helicopter crews):
417.50000 - NFM
417.52500 - NFM
417.57500 - NFM
419.11250 - NFM
419.13750 - NFM
419.18750 - NFM
419.58750 - NFM
449.53750 - NFM
449.68750 - NFM
449.73750 - NFM
These are analogue and are still in use by a variety of helicopter crews.
