The Garngi Rangers are based at Minjilang on Croker Island, which is a site of national conservation significance. They manage approximately 110,000 hectares of land and sea country.
The rangers undertake an early dry season burning programme each year on both the adjacent mainland and the island and control weeds such mimosa, mission grass and coffee bush.
They undertake extensive marine debris surveys and clean ups each year and are involved in a turtle survey and monitoring program at McClure and Grant Islands.
In addition, the Garngi Rangers work closely with the Aboriginal Area Protection Authority in registering multiple sacred sites and installing appropriate signage.