The Mt Parker bushwhack from the south is pretty much as marked on the Countryside map though. Go to the big 6-way path junction due west of the Tai Tam Gap label. Follow the solid orange path (signposted towards Quarry Gap / Tai Fung Au) for about 30-50m until you see the small trail to a big electricity pylon just a few metres off the path to your right. Go up the small trail to the pylon. You can see the start of the ribbon trail on the opposite side of the pylon. It's fairly straightforward to follow. The junction just short of the 532m trig point is also obvious on the ground, with ribbons going off in two directions. Obviously you go right to get to the trig point, then carry on down and up to emerge on the concrete path adjacent to the radar station.