The cache is not at the listed coords. You have to complete the nearby Adventure Lab Explore Logan River Parklands to obtain a password.
Work through the Adventure Lab and record the hints. Next you'll have to sit down and work out the codeword to put into the checker, it might not be as straight forward as you think. Once you get the green light, you'll need to grab your TOTT for one last adventure.
Don't forget to bring your own pen. Happy caching!
You can validate your puzzle solution with certitude.