The NSW Department of Environment and Climate Change (DECC) allow the placing of geocaches on some controlled land provided the placement has been authorised in writing by a DECC officer
From that document:
This policy sets out the conditions under which geocaching can take place in parks.
- Geocachers are strongly encouraged to liaise with the National Parks and Wildlife Service (NPWS) to assess the suitability of a proposed cache location and to seek guidance on the information to be provided in cache listings.
- In accordance with the National Parks and Wildlife Regulation 2009, geocachers must obtain written consent from the Park Authority to place a physical cache in a park.
- To apply for consent, the cache owner needs to fill out the application form which is attached to the policy and deliver it to the relevant NPWS office.
- To assist cache owners in providing current and relevant information, it is recommended that cache listings include links to the department's:
Policy updates and a current Google Earth overlay are available on the Geocaching Association of NSW website.