+ 2nm in Oz, except where otherwise noted. The only place I'm aware of that varies this is NW to NE of YPPH where the Pearce RAAF base airspace causes the arcing limit to be +1nm.
DAL2728 As Smiley says, if it's in the Nav DB then arcing works well, if it's not, then its a series of straight lines, or modulating bank to waffle from one side of the arc to t'other and back again.
