Australian Alternate Minima and Special Alternate Minima
Can somebody steer me in the right direction to find out what the definitions and operational practical use of Alternate and Special Alternate minima on some Australian approach charts.
Does it mean that if the wx at destination is below this minima then an alternate must be planned?
Or if planning for a possible alternate, does the alternate wx need to at or greater than the alternate mimima on the alternate approach chart?