OZZI - Best bet would be to plan for each leg individually. If you need to chage them down the track (like a DEP time slips by a few hours) ring/VHF/HF Flightwatch (where equipped
) and have the times changed. Alternatively, do it airborne within VHF coverage before you land. ATC will take amended SARTIMES if you can't get Flightwatch.
Cheers,
NFR.