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	uboat.net - Fighting the U-boats - Technical pages
		ASDIC, developed through the work of the Anti-submarine Detection Investigation Committee, from which its name is derived, was the primary underwater detection device used by Allied escorts throughout the war.
		If this occurred the ASDIC operator would sound the alarm, feed the range and bearing to the bridge and then immediately start left and right cuts to try to determine the width of the target and trying to see if it was moving from one side to another.
		ASDIC was not very reliable in rough water, nor when layers of different temperature deflected the sound waves.
	www.uboat.net /allies/technical/asdic.htm (1112 words)

	Juno Beach Centre - Anti-Submarine Detection
		The ASDIC is a sonar system for submarine detection developed by British, French and American scientists during WWI; the name is derived from that of the Anti-Submarine Detection Investigation Committee.
		ASDIC sound impulses use a frequency between 14 and 22 kilocycles; the operator of each ship in a convoy must select a frequency different from that used by the neighbouring vessels; otherwise he could intercept the original signal from another ASDIC, resulting in a very loud "ping".
		The ASDIC system has its limitations: it is affected by the turbulence created by propellers or by the motion of ships; it becomes inefficient, therefore, once the submarine has succeeded in slipping inside the convoy.
	www.junobeach.org /e/4/can-tac-det-e.htm (1158 words)

	Definition of asdic - Merriam-Webster Online Dictionary
		from asdics underwater echo ranging, probably from Anti-Submarine Division (British Admiralty department 1916–18) + -ics
		Learn more about "asdic" and related topics at Britannica.com
		See a map of "asdic" in the Visual Thesaurus
	www.m-w.com /dictionary/asdic (33 words)

	Ping Research AB - ASDIC Intrusion Detection
		ASDIC then creates a profile of which computers normally communicate with one another, and what services are used.
		ASDIC, on the other hand, detects abnormal traffic flows, such as someone trying to communicate with a server on a port not previously used.
		ASDIC is distributed and scales well and can handle the traffic volume in very large networks, for example at a large corporation or an ISP (Internet Service Provider).
	www.ping.se /eng/asdic.html (193 words)

	[2.0] Allied Submarines In WWI / Postwar Developments
		ASDIC was not ready by the end of the war, and didn't get to sea until 1920, when one was evaluated on the cruiser HMS ANTRIM.
		ASDIC consisted of a directional sound transducer in a dome that could be generally lowered and raised from the hull of a ship, along with a sonic transmitter and receiver.
		ASDIC did not work properly at higher speeds due to the noise of turbulence around the dome, and at top speeds the dome had to be retracted.
	www.vectorsite.net /twsub2_2.html (3953 words)

	Hydrophones, Asdic, Sonar, S-Gear, and other techno submarine gizmos
		A number of devices were used both to detect submerged submarines, and to allow those same submarines to locate their targets without having to surface or raise the periscope.
		The result of their investigation was called Asdic by the British and Sonar by the Americans.
		In the period between the wars, Asdic was sufficiently developed for the British Admiralty to come to believe that it had rendered the submarine impotent as a stealth weapon.
	jtmcdaniel.com /asdic.html (1830 words)

	Hydrophones, Sonar, and Other Listening Gear
		The result of their investigation was called Asdic by the British and Sonar by the Americans.
		In the period between the wars, Asdic was sufficiently developed for the British Admiralty to come to believe that it had rendered the submarine impotent as a stealth weapon.
		It took only a few weeks for them to realize that it was much easier to acquire a target in an exercise (where the A/S vessels knew there would be one around somewhere) than in combat, where the captain of the U-boat was going to do his best to remain undetected.
	www.fleetsubmarine.com /sonar.html (1496 words)

	YourArt.com >> Encyclopedia >> sonar (Site not responding. Last check: )
		The effectiveness of early ASDIC as an offensive system was limited by the use of the depth charge as an anti-submarine weapon.
		This situation was remedied by the adoption of "ahead throwing weapons", such as Hedgehog and later Squid, which projected warheads at a target ahead of the attacker and thus still in ASDIC contact.
		In 1948, with the formation of NATO, standardization of signals led to the dropping of ASDIC in favor of sonar.
	www.yourart.com /research/encyclopedia.cgi?subject=/sonar (4044 words)

	Side Story
		A problem with early sonars (ASDIC's) was their limited search ability as the oscillator projected its cone shaped beam at an angle of 10 degrees from the horizontal.
		The Asdic's developed during the war operated on a number of discrete frequencies between 14 and 22 Kcs.
		Destroyers, which could damage their domes while operating at high speeds, and minesweepers, which could foul Asdic domes with their sweeping gear, were typically fitted with a retractable dome.
	hmcshaida.ca /sontec.html (1019 words)

	Sonar (Site not responding. Last check: )
		ASDIC, is supposedly an Acronym for the Anti-Submarine Detection Committee which was reportedly formed during the First World War and comprised American, British and French scientists tasked with finding ways to locate U-Boats.
		Early Asdic sets generated a pulse of sound which was shaped like a searchlight angled down at ten degrees, it was hand trainable.
		A typical early Asdic set, a streamlined dome to cut down the noise of water passing over it and to keep the Transducer - or Oscillator - isolated from the moving water.
	www.middle-watch.co.uk /Sonar.htm (1978 words)

	Asdic (Site not responding. Last check: )
		During depth charging, the turbulence of the water made it difficult to maintain in contact with the submarine.
		Asdic was only affective within a 1½ mile radius.
		The operator on a corvette sat in an "asdic cabinet", located at the front of the bridge.
	www.nw.com.au /~stella/Asdic.htm (356 words)

	Casa Loma - Media Room - Press Releases
		ASDIC could detect a U-Boat at a distance of five miles.
		At even the distance of miles the device could calculate 4 the sub's depth to a foot, its distance to within a few yards, its speed to within a fraction of a knot and its course to a degree.
		The ASDIC project continued in Casa Loma from 1941 until the end of the war.
	www.casaloma.org /Media/Kit/PressDisplay.asp?Display=Press&PressReleaseID=21 (480 words)

	::Anti submarine warfare::
		However, major developments in sonar, ASDIC, depth charges etc occurred in World War Two along with new inventions against which the submarine, when on the surface or near the surface, had no defence.
		HMS Starling was an escort sloop with a maximum speed of 20 knots, she displaced 1,350 tons and was armed with 6 x 4 inch guns and 12 x 20mm guns.
		By 1943, ASDIC was also more capable of differentiating between a U-boat and a large school of fish or whales.
	www.historylearningsite.co.uk /anti-submarine%20warfare.htm (918 words)

	ASDIC achtergronden
		asdic management is een initiatief van senior managers die in het hoger kader van profit, dienstverlenings- en non-profit organisaties hun ervaring hebben opgedaan.
		asdic management brengt vele jaren ervaring in een veelvoud van verschillende omgevingen in combinatie met uitgekiende methoden en methodieken.
		asdic management staat een resultaatgerichte bedrijfsvoering voor als een verzameling van managementmethoden die afzonderlijk toegepast kunnen worden en in hun samenhang een logisch geheel vormen.
	www.asdic.nl /achtergrond.html (153 words)

	Harbour Defence Asdics (HDA)
		Asdic was a term used to describe echo location and ranging using high frequency sound waves.
		Asdic research stepped up at the start of WW1 but it was not ready by the end of the war, and didn't get to sea until 1920, when one was evaluated on the cruiser HMS ANTRIM.
		Within the range of the Asdic, the father away a submarine was from the hunter ship, the more likely it was to be spotted.
	home.iprimus.com.au /waldingr/hda.htm (2408 words)

	Naval History.CA - Articles - Tactics, Training & Technology
		Asdic conditions were fair and the sea was smooth.
		Skeena's asdic was not picking up the echo at ranges greater than 1,000 yards; a severe handicap considering the depth of the U-boat ensured the echo was lost at 600-700 yards, leaving a very small window of opportunity for the HSD, Petty Officer A.A. Butchart, RCN.
		The primitive nature of the radar and asdic types carried by RCN escorts ensured that eyesight was still the primary sensor.
	www.familyheritage.ca /Articles/summer1942.html (7739 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: )
		Asdic (Sonar), depth charges and high-speed destroyer minesweeps were to be carried
		In the event, the HA mounting was a failure and was not fitted and cost cutting meant that Asdic and most of the depth charges were deleted.
		More of an improvement was landing 'Y' gun and the minesweeps and fitting Asdic and racks and throwers for a 10-pattern depth charge salvo, 70 rounds being carried.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=A_class_destroyer (1038 words)

	ASDIC, Radar and IFF Systems Aboard HMCS HAIDA - Part 4 of 10
		The Q attachment was an additional Asdic set which required separate transmitting and receiving equipment suitably inter- connected with the main set.
		A set of indicator lamps in the Asdic office indicated the position of the dome -- red was for the working position, green was for housed and red/green for any intermediate state.
		This Asdic set was mainly fitted into frigates and Tribal class destroyers and designed to be used with Hedgehog or Squid (mortar bomb).
	www.jproc.ca /sari/asd_et2.html (6139 words)

	asdic - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "asdic" is defined.
		noun: a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return; sonar is an acronym for sound navigation ranging; asdic is an acronym for anti-submarine detection investigation committee
		Words similar to asdic: sonar, echo sounder, more...
	www.onelook.com /?loc=rescb&w=asdic (157 words)

	Toronto Catalog (Site not responding. Last check: )
		The effectiveness of early ASDIC was limited by the use of the depth charge as an anti-submarine weapon.
		This situation was remedied by used of several ships cooperating together and by the adoption of "ahead throwing weapons", such as Hedgehog and later Squid, which projected warheads at a target ahead of the attacker and thus still in ASDIC contact.
		Developments during the war resulted in British ASDIC sets which used several different shapes of beam, enabling blind spots to be continuously covered.
	www.torontopost.biz /Info/?ASDIC (6805 words)

	Performance of the Whale-Finder (Site not responding. Last check: )
		When the CPUE value rises, the number of whales is inferred to have increased, and if the value decreases, the number of whales is inferred to have been reduced.
		From several years' results, Japanese scientists had concluded that using the ASDIC improved the efficiency of the catch at most 18% when compared with the cases of not using it.
		With this data, anti-whaling scientists insisted the performance of ASDIC, which could find the whales within only 800 meters, could find whales up to 12 kilometers beyond, and calculated that the ASDIC improved the catch efficiency 40%.
	luna.pos.to /whale/gen_ume_asdic.html (552 words)

	Ahoy - Mac's Web Log - HMS Edinburgh - Was there ASDIC contact?
		He states that the claim that an ASDIC contact report was ignored by an officer(s) is completely untrue and he has first hand evidence to prove this.
		He is happy to put the record straight but does not want to give his name because he believes that the situation has become controversial and he does not want to be involved in any political arguments.
		It should also be noted that the ASDIC operations were relayed direct to the bridge by loudspeaker, which meant that no single officer could order that an ASDIC contact should be ignored.
	ahoy.tk-jk.net /Letters/HMSEdinburgh-WasthereASDI.html (1019 words)

	asdic - Search Results - MSN Encarta
		ASDIC network traffic analysis provides an overview of your network traffic, making it possible to...
		ASDIC by Mikael Kuisma Platforms: Solaris Categories: Access Control, Auditing, Configuration...
		Product sheet for ASDIC (PDF) Whitepaper about ASCIC (PDF) ASDIC is a system that maps out the traffic in your network and reports deviations.
	uk.encarta.msn.com /asdic.html (118 words)

	Asdic
		I 1951 konstruerte Forsvarets Forskningsinstitutts (FFI) Asdicavdeling i Horten et kombinert asdic / ekkolodd som skulle brukes i fiskefartøy.
		"Ramoen" var det første norske konvensjonelle fiskefartøy som fikk installert asdic.
		Høsten 1954 ble en asdic fra en av Simrads konkurrenter - tyske Elac - montert i "Rav" fra Sandviksberget.
	www.fiskeri.no /Reklame/Asdichistorie%20side%201.htm (1299 words)

	Calling All Fish \| TIME
		ASDIC, designed for submarine hunting, sends ultrashort sound waves through the water and any sizable object reflects them.
		But as ASDIC and its operators improved, they learned to distinguish skillfully between echo-making objects, could even tell big from little fish.
		In future, schools of herring may be seduced by ASDIC right into kippering plants.
	www.time.com /time/magazine/article/0,9171,887128,00.html (390 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: )
		Along with ASDIC (sonar), Ultra code breaking (COMINT) and radar, "Huff-Duff" was a valuable part of the Allies' armoury in detecting German U-boats and commerce raiders during the Battle of the Atlantic.
		The idea of using two or more radio receivers to find the bearings of a radio transmitter and with the use of simple triangulation find the approximate position of the transmitter had been known and used for years.
		In the Battle of Britain, "Huff-Duff" was the mechanism used by the RAF to track the location of their fighter squadrons in the air.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Huff-Duff (606 words)

	Canadian Navy RADAR Systems
		This radar was first fitted to HMCS BONAVENTURE after her 1967 refit, and remained in service with the IROQUOIS class destroyers until their TRUMP refits in the early 1990s.
		Used on the PRESTONIAN class frigates for 4" gunnery spotting, and some River class frigates in place of a Type 271 (mounted to the masthead in place of a HF/DF antenna).
		It used a simple A-scan, and it was difficult to discriminate between actual targets and reflections from the sides and to the rear of the ship that resulted from emissions that leaked in those directions.
	www.hazegray.org /navhist/canada/systems/radar (866 words)

	Submarine Book Review: The U-boat War
		Foremost on the mind of the U-boat planners was the problem of British ASDIC (sonar), the sound locating system developed near the conclusion of the First World War.
		When the U-boat dived the escorts could strike using Asdic to track it until the boat was sunk or driven to the surface.
		It could dive quickly, had a tight turning radius, and the small size was harder to detect by Asdic.
	www.subsim.com /books/book_uboatwar.htm (1125 words)

	Asdic types used in the Royal Netherlands Navy (Site not responding. Last check: )
		The only improvement came when the British, on Dutch request, began sending Asdic equipment to the NEI for the ships serving in this region.
		After the fall of the NEI, Dutch ships began to receive Asdic and (US) Sonar for their ships, while the ships taken over by from the British and Americans, already had such equipment built in.
		The dome was fixed, because the asdic could take a maximum speed of 18 knots, while the corvette could only do about 16.
	www.netherlandsnavy.nl /Asdic.htm (169 words)

	Anti-Submarine Projector Mks 10 & 11 (Hedgehog) (Site not responding. Last check: )
		The major deficency of the combined ASDIC / depth charge attack was the so-called blind time, of which there were two variants: the first one, already dealt with in the depth charge section, was due to the time it took the depth charges to reach the set depth at which they were to explode.
		The second type was related to the method of attack used by single destroyers.
		There were counter-measures to this problem, for example teaming up, one ship holding contact while the other deployed for a silent, slow attack.
	www.microworks.net /pacific/armament/mk10&11_hedgehog.htm (288 words)

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