On another note it was said that should not worry you if you don't fly below 500 feet. When you consider that these a replaces on top of ridge lines and at crookwell for example you will be a circuit hight and level with them.
Probably my comment, for the benefit of Yr Right the 500 ft refers to AGL, ie the aircraft will not fly lower then 500 ft above ground level, hence if the terrain is 3000 ft then it stands to reason said aircraft shall not descend below 3,500 ft MSL lest the pilot shall smite his aircraft into the planet be it either in a ridge or a valley ....