not quite sure what you are chasing the entire western side of warnbro sound is reel (see chart dmh227)you have got starting from the north of the sound, second rock, third rocks, passage rock, channel reef, the sisters, then approx dead south of the sisters you have a large reef that stretches for approx 2-3 hundred metres in broken sections.If you look at the chart take care and be aware that waves break on all these reef and caution is required i wouldn't go there at night unless you are very convesant with the area.

are you chasing a fix for a specific section of the reefs?

Well you dont need co-ordinates. The artificail reef, which one, there are many to choose from. However I suspect you want the one that starts about 800m out from the third car park. This area is vast in size and has nemorouse lumps or reef to itl.

The third car park is is at the Western end of a street called Cappalar Pass, found off the Southern end of Fendham Street in Warnbro, Get your self 800 meters to 1.5 km off this car park that overlooks the sound. You will be travelling from the beach toward the exit passage out of Warnbro Sound

You will notice that you will be 500m north of a newish yellow float that tracks all of the 5 meter great whites that patrol Warnbro Sound. The Great White bouy can bee seen from the car park on a south west bearing.

Have a look at your sounder, it wont be hard to work out flat bottom from any reef you pass over. Look for large areas of sonder markings above the very flat Warnbro Sound bottom.  There is heass of reef to fish from, and you will be surprised as to how far west the western edge of the system can be. The bulk of the reef here is in a north south lay. Remember it is a long / large area or bits and pieces.

Dont anchor up untill you see bait aggerations on your sounder. Any rig set up will do for the bait fish, keep the hook small like size 4 to 8 .  Lead heaviy enough to reach bottom before you fall asslep. I use sinkers to get me down and keep a tightish line.

Anchor up, burley up, keep a floater out for any snapper or smaller sharks that are in the mood. Burley like mad for extra fun. Keep a squid jig out for extra bait and squid rings.

Hands in the boat or you may end up with one glove too many :) , and have a good time. Its a great place for kids to get into the action.

 Or ya could just go here.. as far as navionics goes.. 32 20.760S 115 43.660E ,been told its not quite right, but, probably a well known spot down there but go and sound out some action, or wait til evening and it'll prob be full of boats like the d9 last sat night(pack all current safety gear this time of year cause the water police are checking ya out.. and fisheries making sure ya sticking to the rules back at the ramp after dark).... as with all spots, wrecks, etc, if ya sounder aint showing signs of life then look elsewhere... tub rock is a known spot for snapper, otherwise the reefs in comet bay(james reef etc), have some shell/sand ground that just has to work, havent been that far south myself for a long time, but its on the 'to do' list once my boat is up n running again.. good luck.. post pics mate

Troy