Shark Rock Ridge lies east of the old Yatala Trig Point (removed for the M1) and links with Want Spur east of Berowra in Ku-ring-gai Chase National Park. There's a narrow walking track to follow all the way to GZ a little over 3kms from the Berowra Train Station, but pay attention or you may find yourself off it. There is the beautiful bush, views, rocky outcrops, old telephone lines and carvings to see on the way.
The description below is based on leaving from Berowra Station.
From the station head north to the start of the walking track to Waratah Bay (near the northern carpark). Cross over the railway and freeway then turn LEFT (north) instead of going straight down to Waratah Bay. Follow the little walking track past the hobo camps to the end of the road cutting, then down along the top of the freeway embankment to the next cutting to the north. Here the track climbs up the east side of the cutting and runs along the fence line at the top well away from the road. It ducks down to the road again at the end of this cutting and once again follows the top of the embankment to the next cutting along where it climbs again following the fence. (The short embankment sections have plenty of room behind the guard rail so there is no need to walk on the freeway). At about S33 36.865 E151 09.691 the little track veers away from the freeway NE along the ridge line - follow this to GZ. Pay attention as it's easy to lose the track along the ridge line. There are a series of little cairns that help mark the way. Allow about 2 hours for the return trip. Bring plenty of water.
You can continue on to Want Trig. from GZ but the little track gets progressively harder to follow from here so good navigation skills are required. If you want to make a day of it then you could loop back via Pinta Spur and Jerusalem Bay then back to the railway at Cowan. (The map in the gallery shows this complete circuit).
To log this cache simply post a photo of yourself, or part of you with the telephone points (one remains in place) in the background, or other interesting features to prove you were there and tell us about your experience.
Congrats to AussieMickeyD on being the first to find this Virtual! Second to mount the podium was Crash2079. Thanks for setting the log standard for others to emulate.
Virtual Reward - 2017/2018
This Virtual Cache is part of a limited release of Virtuals created between August 24, 2017 and August 24, 2018. Only 4,000 cache owners were given the opportunity to hide a Virtual Cache. Learn more about Virtual Rewards on the Geocaching Blog.
Another Good description of the way there... https://hikingtheworld.blog/2020/05/24/shark-rock-ridge-berowra/