[netcdf-java] Writing trajectories and multi trajectories with nectdf-java

Hi all
I am considering using netcdf-java to write large amount of ship track data
but I am not sure how to do it "correctly" with netcdf-java so that other
programs that support multi trajectories can use the data i am writing.
Does anyone have a recipe or code samples how this should be done?
I have also discovered that trajectories is missing in toolsUI4.1 but is
present in 4.0. Any reason why this is removed?

Best Regards
Kjell Røang