Simlink - They are spreading superphosphate fertilizer. Its not really about how many passes as they might just do one long pass covering a number of paddocks or they might do ten or so passes if its a small paddock so its like how long is a piece of string.
407driver - They are based at Ardmore airfield just south of Auckland but the topdressing was being done out towards Alfriston, country suburb of Auckland and the spraying out on the Manukau Pensinula, over the other side of the harbour from Auckland Intl Airport.
Autorotate.