Braddon Constitutional cross Mystery Cache

Based on "X The GZ" by Sacada. This requires the use of Google Earth. Find the following points within Canberra. Join the lines and where they cross is near the cache. Use the crossover point in the formula to get the precise location.
Start Point 1
Hint: Dave, Grace, John, Tom, Terry and Kitty (Creek)
End Point 1
Hint: Slie Mountain
Start Point 2
Hint: Link north to south. If ever out of court.
End Point 2
Hint: 11 11 18 11

Now you have the "Braddon Constitutional Cross" marked you should have a coordinate where they cross (We are not interested in too much accuracy):

To get the Coordinate of the cache use the following formula:

• S 35° AB.CWX
  E 149° D.EYZ
  
• W=14-C
• X=D-4
• Y=9-E
• Z=B+3

The Cache is on public land but surrounded by houses all looking over the cache. Be stealthy be careful.

As with any urban cache there maybe other things laying on ground near cache so use caution and dont get a needle stick.