RAN STATION 4 INDICATOR LOOP
AND HARBOUR DEFENCE ASDIC STATION,
BRIBIE ISLAND, QLD
Part of the Royal Australian Navy's anti-submarine harbour defence for "Fortress Brisbane"
|visits since 25 February 2001|
The Royal Australian Navy approved the construction of anti-submarine defences for Moreton Bay on 22 June 1942.
HMAS Bangalow completed laying four Indicator Loops and three (or was it four?) Harbour Defence Asdic (HDA) systems across the entrance to Moreton Bay by 24 December 1942. The Bribie Island Indicator Loops were commissioned on 5 February 1943. The Royal Australian Navy established an Indicator Loop Hut and 2 Generator huts known as RAN4 on the Beach at Woorim on Bribie Island in 1942 at a cost of £1,000. It was constructed by the Civil Construction Corps being completed on 30 September 1942. An accomodation complex was also constructed at a cost of £2,100. There were 5 officers and 21 Naval ratings based at RAN4.
The four indicator loops which stretched a distance of approximately 16 kms across Moreton Bay, were on a line from Bribie Island to Skirmish Banks to Spitfire Banks to Salamanda Bank to Comboyuro Point on Moreton Island. The three (or was it four?) HDA's were located approximately 2 miles south of the loop systems.
RAN4 comprised the main Indicator Loop Hut and two smaller concrete buildings (about 18ft x 14 ft x 10ft high) which housed a Mark 2V60 Rushton Vertical Oil engine which drove two DC generators to power RAN4. One generator produced 7kW at 220V DC and the other 2 kW at 110V DC. One generator building was about 100 yards north of the main Indicator Loop Hut and the other was a similar distance to the south. This southern generator hut now stands in the middle of the picnic grounds at Woorim.
Some of the rooms in the main building were the Indicator Loop Room, the Harbour Defence Asdic Room (HDA Room), and the Binocular room. While the cables were laid for the Harbour Defence Asdic system it was never commissioned.
There was still evidence in the year 2000 of the 4 loop cables that ran from the Indicator Loop hut at Woorim to Combouyuro Point on Moreton Island.
A decision was made on 31 July 1944 to remove the seaward defences for Moreton Bay. RAN4, the Outer Indicating Loop Control Station on Bribie Island ceased its watchkeeping operations on 3 August 1944 and at the same time HMAS Bangalow raised the Outer Indicator Loops and the HDA's.
In about 1995, the local Bribie Island Rotary Club, the Naval Association, the Returned Services League (RSL) and the Caboolture Shire Council commenced a project to restore RAN4, the Indicator Loop Hut at Woorim.
SOUTHERN GENERATOR BUILDING
INDICATOR LOOP HUT
NORTHERN GENERATOR BUILDING
BRIBIE ISLAND RSL AND SENIOR CITIZENS CLUB
Seaward Defences for Moreton Bay
Fort Cowan Cowan
HMAS Tambar hit by "Friendly Fire" from Cowan Cowan, Moreton Island
American Submarine USS Triton
accidentally sunk in Moreton Bay by friendly fire?
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Bribie Island Indicator Loop
An excellent piece of research on RAN4 by Richard Walding
Worledge, G.R., "Contact! - HMAS Rushcutter and Australia's Submarine Hunters 1939-1946", The Anti-submarine Officer's Association, 1994
by Ron Donald
The book is available from the Bribie Island RSL, Toorbul St., Bribie Island, QLD 4507 for $5:50 at the Club or $7 (postage Included)
I'd like to thank Richard Walding, the Head of Science Department, Moreton Bay College for his assistance with details on RAN4.
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© Peter Dunn 2003
This page first produced 25 February 2001
This page last updated 04 October 2005