Kiwblue -
To become a certified UNICOM operator in NZ you must hold either a pilot licence or an Air Traffic Control licence, if so then you have 50hrs on job training....
If you are Civilian, ie no formal aviation qulifications then 100hrs training on job.
Piston Broke - In New Zealand, you cannot be personally 'sued' especially if you work under a company as an employee, if you are a sole trader/ Company owner then yes, in which case you would surely have indemnity cover as a responsible business owner....or have everything in a trust
