Distance: 1.2 km (0.5 DOC hours) - Unmarked route, clear - Easy-moderate terrain
Altitude: 496m to 584m. Gain: 29m. Loss: 114m . Gradient: 7 deg (Gentle)
Skills:

Unmarked route, clear (7/9)
Unmarked route, follows obvious geography (river, spur, trail, etc)

Secondary, unmapped (4/5)
Route not on maps, an alternative recognised access to hut or along range / catchment

Gentle (difficulty: 2/5)
Gentle slopes

Easy-moderate (difficulty: 2/5)
Tussock / river-gravel / open bush / cut track

None (difficulty: 1/7)
No alpine skills required

None (difficulty: 1/6)
No unbridged river crossings

None (difficulty: 1/7)
No alpine skills required

For the most part the route from pt600 to pt510 is well marked.

A broad, cut, but unmarked track heads due east from pt600 before swinging north to pt510. One spot of windfall made this hard to follow, but it was an otherwise easy track to head down. It eventually enters PNCC-owned forestry a few hundred meters short of pt510, and becomes a grassy 4wd track. At pt510 you can head SSW to reach the start of the Punga Hut track via forest tracks, or continue straight on to hit the main forest access road over a ford just inside the main gate at the end of Scotts Road.

Note: Described in the reverse direction to your journey

Head SE from pt510 on forestry tracks. Soon the track swings east off the ridge - ignore it and continue up the ridgeline through sparse open pines. The pines soon end and native bush begins. Scout around for a well-cut but unmarked route continuing up the ridgeline. Once found, this provides an obvious route to pt600.