Frederick Reef is in the Coral Sea Islands, over 220 nautical miles (410 km) northeast of Gladstone, Queensland.

Observatory Cay is approximately 1.8 metres (5.9 ft) above sea level; with a possible landing site on its northern side through a boat channel which leads in from North East through the reef.

A small cay ls located 900 metres (3,000 ft) south of Frederick Reef Light.

On 11 June, the ship ran aground on Frederick Reefs; the masts were cut away to steady her while the crew and soldiers moved to shore with water and provisions before she sank.

A party took the surviving longboat and travelled to Moreton Bay, arriving in July and causing the brig Amity to be dispatched to collect survivors.

On 6 November, Australian destroyer HMAS Vendetta and civilian tugboat Carlock arrived to assist the salvage of Tiru.

En route, Tiru called at Guam to provision alongside Proteus (AS-19) and pick up new crew members.

On 23 April 1986, Jhansi Ki Rani, an India-flagged bulk carrier departed from Newcastle, New South Wales for Japan with 74,000 tonnes of coal on board.

The route for the voyage had been planned and plotted by the Second Officer, approved by the Master, and was to take the vessel 10 nautical miles (19 km) east of Frederick Reef sometime on 26 April.

The ship's Master arrived on the bridge at 1725, to confirm the progress of the voyage and to prepare for the passing of Frederick Reefs.

Shortly after this, the Chief Officer and lookout both reported a white line close ahead; waves breaking over the edge of the reef.

The vessel was recovered and refloated on 4 May, and after being anchored for inspection, was towed to Singapore for repairs, then put up for auction with her cargo of coal.