Draculas Teabag
I'm not sure what 'trial' you are talking about, CPDLC is always used (as far as I'm aware) in the YMMM/YBBB (melbourne/brisbane) FIRs when the aircraft is so equipped.
True. CPDLC equipped aircraft generally are logged on, but VHF remains the
primary communication method when in coverage. For instance, if you downlink a CPDLC request for level change when in VHF coverage, you are most likely to get an 'UNABLE' response (to close the message) and then a response via VHF.
The 'trial' is to determine the benefits of making CPDLC the primary communication method (for appropriately equipped aircraft) even in VHF coverage.
Wingtip777
Sorry I can't give you any info on whether or not you require training. It seems you would (we do), as there are some 'traps' if you don't know what you are expecting.