two men. The use of solar energy which is freely and readily available has resulted in a reduction of operating and maintenance cost. Present-day lighthouse The present lighthouse equipment consists of a main and standby rotating beacon, each producing 117,000 candelas with a nominal range of . A radar beacon (racon) was also installed at the lighthouse which provides additional navigational information to ships by emitting a Morse code on the ship's radar screen. In 2005, an Aids to Navigation Automatic Identification System (AIS) was installed to broadcast additional positioning information to ships. Coral reef surveys The National Parks Board, National Biodiversity Centre, Blue Water Volunteers and volunteers from the public started a coral reef surveying programme in 2005 to monitor the status of hard corals (Scleractinia), mobile invertebrates and coral reef fish at several locations around five southern islands, including Pulau Satumu on which Raffles Lighthouse is located. Internationally recognised techniques developed by Reef Check and the Global Coral Reef Monitoring Network were adopted for this programme. See also List of lighthouses in Singapore Action of 13 December 1964 References . External links Raffles Lighthouse on the Lighthouse Depot website (with photograph) Raffles Lighthouse on the Singapore Infopedia website Satellite image of Raffles Lighthouse and Pulau Satumu on Google Maps Singapore on the Amateur Radio Lighthouse Society World List of Lights (WLOL) website Islands of Singapore Lighthouses in Singapore Lighthouses completed in 1855 Western Islands Planning Area