It is an umpire!
You can be an umpire really easily. You can help out at your local school, university or club. Or you can go on courses that England Netball run.
The officials in netball are the umpire, time keeper, captain and coaches
An umpire calls all the shots and uses a whistle
the minimum a netball umpire would get paid is $8
Yes, as an umpire you will umpire the same half for the whole game.
A Whistle... :) <3
Netball has umpires, not referees. (See for example Australia's Umpire Accreditation: http://www.netball.asn.au/extra.asp?id=3037&OrgID=1)
Its not judge it has an umpire like how soccer has a ref