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Originally Posted by vdr1981

This is from http://www.uboataces.com/hydrophones.shtml

The S-Gerat (Special Apparatus for Active Sound Location) was essentially sonar. It transmitted sound pulses and timed the returning echo to detect underwater objects. Because it emitted sound pulses which also broadcasted the U-boat’s location, this device was not very popular. It could detect objects up to 4,000 meters away.

This is what I have found on uboatarchive.net:

"U 570" - Interrogation of Crew - C.B. 4051 (31), October 1941

(vii) Detector or "S" Gear (Such-Gerät, usually known as S-Gerät)
The S-Gear is the German asdic and is manufactured by Electro Acoustic of Kiel (commercially as the Ultrameter) and by the Atlaswerke of Bremen (commercially as the Periphone).
It consists of a combined Magneto Striction transmitter or receiver which can be used for telegraphy and telephony, echo-ranging and hydrophone effect listening. The frequency used is probably between 15,000 and 20,000 cycles.
The apparatus, which is retractable, projects through the ballast keel near the fore end of the control room.
It is a short range supersonic echo-ranging apparatus of the magnetostriction type and is fitted primarily for mine detection purposes. It is only emerging from the experimental stage and "U 570" was one of the first, if not the first U-Boat to be fitted with it. In its present form it is not very serviceable; "U 570's" apparatus had broken down and was not in working order at the time of her capture.
The maximum range of detection is 500 metres and the practical range about 300 metres. The combined transmitter-receiver comprises four packs of nickel stampings and was said to be energised with 4,000 volts transformed up from a 110-volt supply. The beam angle is stated to be + 45° and no means of training the beam is provided.
Prisoners believed that the amplifying and recording unit of the S-Gear is known as the A.E.G. apparatus (since it was made by the A.E.G. Company). The transmitted and received pulses are applied to a cathode ray tube in front of which is an optical projection system which casts an image of the C.R. tube trace on to a ground glass screen provided with a range scale graduated in metres.
An earlier statement that the S-apparatus was used for "blind" underwater firing of torpedoes has been contradicted and is not now believed.

REPORT OF INTERROGATION OF SURVIVORS OF "U 574", SUNK ON 19th DECEMBER, 1941.

(ii) "S-Gerät" (Detector Gear)
"U 574" was stated to have been fitted with a form of "S-Gerät," which could be inclined 80 up and down and also sideways. This S-Gerät was stated to have a range of 400 metres, and to be used only for detecting nets or minefields. Prisoners stated that a visual indicator (Mattscheibe) was employed; it was not often used for fear of betraying the U-Boat's position.
(N.I.D. Note. S-Gerät appears to cover all forms of transmitting detector apparatus.)

REPORT OF INTERROGATION OF SURVIVORS OF U-701, September 17, 1942

S-Gear or German Asdic (QC Gear): The captain would not admit that U-701 was fitted with S-Gear and stated that he would have had very little use for it. He gave the impression that his opinion of this apparatus was not high.

REPORT ON INTERROGATION OF SURVIVORS FROM "U 444", SUNK ON 11th MARCH, 1943

(vii) New Type German Asdic
A prisoner claimed to have seen a new short-range S-Gear (German asdic) made by Siemens. It has dial adjustment in two settings: 80-300 and 300-1,000 metres. Frequency of the note used is 800 cycles per second.
It was alleged that this S-Gear was on trial in a few U-Boats, one of which was lost by betraying its position through its use.
Trials are now being made with short-range inaudible S-Gear.

Interrogation of U-Boat Survivors Cumulative Edition - C.B. 04051 (103), June 1944

(vi) German Asdic (Suchgerat")
Despite the fact that the Germans have captured many British Asdic sets their own gear of this type is still somewhat crude.
(a) U.S.G. (U-bootsuchgerät). Generally known as German Asdic. The only submarine to which it was fitted was U.43 although all 500-ton U-boats have provision for fitting it in the form of the S-Schacht (Asdic shaft). This, however, is nowadays used for stowage. It was considered that it would betray the U-boat's position too readily.
(b) A.E.G. Gerät (A.E.G. gear) (also known as Nahsuchgerät N.S.G.). It is no longer fitted to U-boats. Its purpose was to detect mines and other small objects ahead of the U-boat and consisted of a supersonic oscillator transmitting a beam ahead. Range was only about 500 yards.

Summing up:

- the early version of the S-Gerät had a range of barely 300-500 m, much shorter than reported on uboatacs.com;

- it was used mainly to locate mines and u-boat nets ahead of the sub;

- it could (and it did) give up u-boat's position;

- for this reason only few u-boats carried it, and even when fitted, it was hardly used;

- during mid war the Germans carried experiments on the apparatus, striving to make it inaudible to enemies and to extended its range up to 1,000 m ahead (this is still shorter that stated on uboataces).

- experimens on the search gear had to end up a blind alley, and starting from at least June 1944 (probably before), the apparatus stopped being used at all.

Originally Posted by vdr1981

OK, I've found it...

Modified Page layout.ini will do the trick...

If anyone else want it, just let me know...