No, it's a mod, you turn it on in the launcher.

do i buy this in game or is it equipped cos it sounds good !

It's up to date, I use it every time I play UBOAT

Please update

Yup, I'm using it.

Is this 2025.1 compatible?

Does UBOAT game really take the dead zones of GHG and KDB into account? For me there are no dead zones with GHG. Not in manual listening mode and not when an ai officer operates the hydrophone.

Have you had any other experiences?

yes, that's what i thought too, since i work a lot with the hydrophone in submarine but always make extreme mistakes with the range to get an accurate bearing, 60 -100 km range is just too much. at least in my opinion

The real ones? They don't so much have a range. After all, it depends on not only the device, but the ocean environment, the source level, and whether or not there's an acoustic path between the source and the listener at all. It could be anywhere between 1km and 100km, though the latter might not have happened at all during WW2, definitely not a normal occurrence: needs everything to be perfect. Quiet sea, good weather, quiet boat, loud contact, connected by a convergence zone.

Think of it this way: what is the "range" of your hearing? It will depend on pretty much the same factors as it does with sounds in the sea.

what range do the hydrophones have, U boat gives it as approx. 100 km, the mod team of Silent hunter grey Wolfes with approx. 35 km

https://github.com/mygamingaccount/ghg-hydrophone-demo?tab=readme-ov-file#source-material

Check my source material, it's all there.
The compensator disk isn't in an airtight area, it's accessible to the operator for routine maintenance. So the disk, the brushes, the striplines are all fairly easily accessible. You can even see hinges to hold the compensador disk in place while the striplines are cleaned.

You can make out the scaled outline of the GHG-Balkongerät on photo 7 of the AN301. Those are the brushes that feed the delay line via the strip lines. You can also see the back side of the disk: concentric sliprings that connect to the hydrophone preamplifiers.

Ah, electric connection brushes used for moving surfaces.

if you dont mind further indulging my curiosity, though I still wonder what you mean by them being dirty, I dont know how theyre set up but I would think they would be isolated in an airtight/watertight chamber, but maybe not. Or do you mean a "dirty sound" as in less clear hearing of the waters because of the brush friction and electrical changes during motion of the brushes(Crackling, popping, ect)?

I didnt even see hydrophones on the list on that interesting webpage with much information on it.

cdvandt.org

Carbon electric brushes. They connect the audio signals of the individual hydrophones to the striplines that feed the delay line.
From the manual of the beamformer (cdvandt.org)

IV. Operating instructions.
c) Troubleshooting
If you hear a scratching or crackling noise in the headset when turning the handwheel, clean the contact points in the switching mechanism of the compensator. First, disassemble the switching mechanism and rub the strip collector with a clean, lint-free cloth (leather) soaked in rubbing alcohol and re-grease it. A bottle of rubbing alcohol can be found in the spare parts box of the compensator.
If unsuccessful, clean the strip collector thoroughly with a brush. If this also does not fix the issue, the grooves between the strips must be scraped out with a special tool. This must be done with the utmost care by a fitter from Atlas-Werke.

dirty brushes?

The hull that the hydrophones are installed in is angled slightly forwards. The sounds that you pick up from 0° relative will be heard at full volume due to the direct line of sight (line of sound?). A 3d hydrophone simulation would have some attenuation of sounds coming from above, maybe one day this will be possible to add. But sounds from that angle would be so close you'd hear them without the GHG through the hull of the boat.
The smearing of bearing accuracy near 0° is something I wish to add however.

No scratching sound must come from the headphones. The keyboard or your mouse should be sufficient feedback.

Thanks for the good QoL mod, very handy to have and saves a bit of headache.

I've tested in a bit and have some general feedback:

* the brushing sound while a little bit annoying in vanilla can actually be good feedback - maybe keep the sound but make it 10-25% of the volume in vanilla? Perhaps 10 when turning slowly and 25% of vanilla sound when turning fast?

the idea behind that is to ensure players have feedback that they are rotating if they close their eyes while doing the turn input.

* I know this isn't necessarily your mod but I've definitely picked up several hydrophone contacts in the supposed dead zone on my boat (with engines on slow ahead - e.g. 0 degrees relative) where I can still definitely hear them, is the dead zone properly modelled in the game?

The ambient noise of the sea is back.
I unintentionally removed it together with the sound of the dusty compensator.

Nope! Thanks for letting me know!

I noticed the mod also removes the sound of the ocean. Intentional?

You use it like Heinrich uses it in Das Boot.

Either with A/D, or you can grab the hand wheel with the mouse

How does one rotate the hydrophone? or does the crewman just keep spinning it about on his own?

@Hard
I don't get it. Why clarifying "blind spots" when the mod is about correctly simulating the hydrophone station angle pointer: it should be rotating freely instead of blocked near 180° as in vanilla. GHG or KDB doesn't even matter how the station angle pointer works.

@Dust: for starters, a gyro compass receiver in the view would be nice! Though at least now you can see your heading by pressing Alt.

@Hard, you have described perfectly well an acoustic phenomenon, one which is also detailed in the manual.
Now tell me: does this acoustic phenomenon justify installing a mechanical peg on the inside of the listening device to prevent the free movement of the compensator? No it does not.
Instead, the manual clearly states that the AN301 compensator, when configured for hull GHG operation, will switch between the port and starboard halves of the array using a relay, whenever the bearing passes either above 0° or 180° .

Really convenient! Makes it closer to the SH3 hydrophone, which is what I'm used to. Wish it had a more narrow pointer, and actually readable bearing indicators, but I presume that is much to ask without the main modding tools. Never the less, very handy mod, has made using the hydrophone much less tedious! Thank you!

One of us is right: the one who read the manual. You only disagree with me because you haven't read it yet.

Version 2: the scratchy collector has been thoroughly cleaned.

At least then it will be clear where the pointer is indicating.

Yes, I wanted to point out that the hydrophone scale isn't similar to the real one. Therefore, it would be appropriate if the developers could fix this. Like in Silent Hunter, where it's done well.

Das Boot had (and still has) a very accurate replica of an Atlas GHG. There's a real one in Chicago aboard U-505.
Watch how the operator uses it in the movie! Rapid movements around to track many bearings simultaneously. This is how they used to do it.

The KDB would have a different type of receiver, and it would need to be controlled by hand from between the torpedo tubes. Just one reason why it didn't catch on.

https://imgur.com/a/NMIK2DQ

The box in the UBOAT listening room is modelled off what you can find in Laböe aboard U-995. That box is not a GHG, it is a kitbashed dummy made of spare radio parts they found in a nearby Flohmarkt.

As you can see on the diagram of the GHG above: the compensator wheel with 3 brushes (out of 48 ), striplines underneath, and the LC lag line.

In any case, the second type of hydrophone in the game seems to be designed to be rotated 360 degrees. This is the same type as the one on the submarine in the series Das Boot (it looks like a radar). Additionally, the hydrophone scale was completely different. It was much more convenient. Therefore, the mod is definitely useful when using the KDB

Of course. The signal from the hydrophones intentionally connects to the compensator wheel via slip rings so that it can be rotated around freely. And on the other end, carbon brushes connect the signals to the stripline collector that feed the lag line.

I am sure you are talking about different things. By 'dead zone,' it is meant that when turning the hydrophone to a certain angle that falls into the dead zone, the hydrophone will not be able to hear what is happening in that direction. But this doesn't mean that you can't rotate the hydrophone dial 360 degrees. Or does it?

Actual knowledge is within your reach, yet you go and quote uboat.net of all places.

Tell me you haven't read the manual without telling me that you haven't read the manual.

Snaut if it worked like you say it does then it would not be possible to go from a port side bearing to starboard: there is a "dead zone" in the front, so it is therefore (according to you) impossible to turn the wheel over.
Nonsense.

"GHG ( Gruppenhorchgerät)
Standard hydrophone system mounted on Type VIIC u-boats. Consists of 24 hydrophones mounted on the sides of u-boat's bow. It has two dead zones - 20 degrees arc on the bow and 60 degrees on the stern - from which it cannot capture any sounds.

KDB (Kristall-Drehbasisgerät)
Tier I hydrophone system. It's a set of 6 hydrophones that can be rotated around one axis. This simple solution allows for perfect triangulation, but placement of this device make it vulnerable.

GHG-Balkon
Tier II hydrophone system. Consists of 48 hydrophones mounted on a dome attached to the bottom part of u-boat's hull. It has only one dead zone that spans 60 degrees on the stern."

From 150° to 190° the operator goes around the shorter path, through the back, not the longer. There is no purpose for a mechanical stoppage at 180° of the compensator wheel.

Both of you are wrong. GHG manual is right there for you. The bearing goes around 360°. What you are confusing this with is an entirely different phenomenon: it is acoustical, not mechanical.
RTFM

Hard is right, you were wrong, read more sources. Also KDB had a blind spot at the back because there is a kiosk behind it and you can't listen through the kiosk, it's logical. The best results were achieved with a hydrophone mounted in the nacelle at the bottom of the fuselage. Earlier versions never had 360 degrees of listening. You didn't need to work hard on this.

Here's a link to the simulator I built based on the original plans, links to sources are in the readme: https://github.com/mygamingaccount/ghg-hydrophone-demo

Hi Hard I suggest you read the actual Atlas GHG manual from Arthur O. Bauer's site. When you did and you understand how they work, you will see why my change is necessary.

You confused the hydrophones, and it is implemented correctly in the game.

The GHG hydrophone is passive. It consists of 24 hydrophones fixed rigidly along the sides of the submarine. Therefore, there are blind spots of 15 degrees at the bow and stern.

The KDB hydrophone was installed on the deck and could rotate 360 degrees.

Wondering if the annoying hand wheel noise is gone due to this mod or if it's the latest update that removed it. Anyway, I'm just glad it's gone!

Awsome Thanks

UBOAT makes you turn it aaaaaallll the way around when you'd want to adjust bearing by a little