Resting on the bottom for a few hours..

JamesT73J · 02-09-10, 01:37 PM

I don't think the idea of a coastal ASW vessel being on constant sonar watch that strange; it's probably a standing order; I know they certainly were when on escort duty. It must be hard work with such a shallow environment with lots of traffic. Anyone try SH1? Coastal DD's used to ping constantly, and they usually detected you.

I'm going to replay later trying the silent running method. If I'm detected passively I can only assume that there is some noise emission even on silent running.

I come from SC / DW with the knowledge that all platforms emit noise all the time, to some extent, so it's merely a matter of the emitter being close enough to the listener before detection occurs; it was therefore highly unlikely that one could close on a vessel with listening gear unless acoustic conditions were very very bad.

Frank0001 · 02-09-10, 02:31 PM

I've had a few times where I'd wait on course of a fat convoy, silent running and engines off. The escorts would still pick me up if they're close enough.
Sometimes they just sail happily by.

GREY WOLF 3 · 02-09-10, 02:32 PM

Astic is A system using transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distance to the floor of a body of water. So with no sound at all it picks up THAT BIG MASS of metal in your case a sub.

Jimbuna · 02-09-10, 04:05 PM

You need the cloaking device mod otherwise there is no way of hiding your presence.

Stoooopid game engine

Leandros · 02-10-10, 02:57 AM

Quote:

Originally Posted by GREY WOLF 3

Astic is A system using transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distance to the floor of a body of water. So with no sound at all it picks up THAT BIG MASS of metal in your case a sub.

But then you ought to hear the pinging. My experience is that, for a example a lead escort, only starts pinging after it has got suspicious about you.

JamesT73J · 02-10-10, 03:57 AM

Quote:

Originally Posted by Leandros

But then you ought to hear the pinging. My experience is that, for a example a lead escort, only starts pinging after it has got suspicious about you.

This is my experience. ASW units seem to listen passively, then locate using active sonar. I notice that silent running disables torpedo loading, pumps, the snort mast (if you have one); I suspect SH3 sums these things (along with your motor and screw noise) into an emissions total. There appears to be no particular penalty for having the pumps switched off; in AOD you couldn't do this for long periods as you'd start to sink as the bilge filled up.

I tried the scenario again, this time running very slowly and using silent running. I was able to stay in Gibraltar harbour for 24 hrs, with no bother.

Much as I adore GWX I wish the escorts weren't such good listeners, especially early war. You can't go flank underwater within 4km of an escort sometimes. Late-war this is completely understandable (there are many cases of u-boats detected ahead of convoys purely by passive means) but early on during the happy times they could do with some ear plugs.

J

Jimbuna · 02-10-10, 08:53 AM

In the early war period there are fewer escorts with veteran and elite status which should dampen down the listening ability/effectiveness of some, but not all.

ryanglavin · 02-10-10, 09:30 AM

I wish someone put the Seawolf Class sub in SH3 to be compatible with GWX 3.0...

Firing missiles while 20 miles away at a convoy would be hilarious...!

G7eT2 · 02-12-10, 06:52 PM

From what I have read convoy escorts and patrol vessels did ping the entire time they were on duty, regardless of whether they suspected anything.

Presumably the game does not model this because it would be incredibly annoying to have to listen to all the pinging anytime an asdic equipped vessel was close by.

So you may actually be being detected by asdic initially rather than hydrophone effect, and the game then starts up the pinging sound effect to add to the atmosphere of being hunted.

I could be wrong and will no doubt be made fully aware of the fact if I am.

02-09-10, 02:31 PM	#2
Frank0001 Chief Join Date: Apr 2008 Posts: 317 Downloads: 16 Uploads: 0	I've had a few times where I'd wait on course of a fat convoy, silent running and engines off. The escorts would still pick me up if they're close enough. Sometimes they just sail happily by. __________________ Snipers of the Seas One eel - one Kill

02-09-10, 02:32 PM	#3
GREY WOLF 3 中国水兵 Join Date: Jan 2009 Location: Down deep avoiding drm attacks Posts: 284 Downloads: 33 Uploads: 0	Astic is A system using transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distance to the floor of a body of water. So with no sound at all it picks up THAT BIG MASS of metal in your case a sub. __________________

02-09-10, 04:05 PM	#4
Jimbuna Chief of the Boat Join Date: Feb 2006 Location: 250 metres below the surface Posts: 190,615 Downloads: 63 Uploads: 13	You need the cloaking device mod otherwise there is no way of hiding your presence. Stoooopid game engine __________________ Wise men speak because they have something to say; Fools because they have to say something. Oh my God, not again!!

02-10-10, 08:53 AM	#7
Jimbuna Chief of the Boat Join Date: Feb 2006 Location: 250 metres below the surface Posts: 190,615 Downloads: 63 Uploads: 13	In the early war period there are fewer escorts with veteran and elite status which should dampen down the listening ability/effectiveness of some, but not all. __________________ Wise men speak because they have something to say; Fools because they have to say something. Oh my God, not again!!

02-09-10, 01:37 PM	#1
JamesT73J Medic Join Date: Jan 2002 Location: United Kingdom Posts: 167 Downloads: 9 Uploads: 0	I don't think the idea of a coastal ASW vessel being on constant sonar watch that strange; it's probably a standing order; I know they certainly were when on escort duty. It must be hard work with such a shallow environment with lots of traffic. Anyone try SH1? Coastal DD's used to ping constantly, and they usually detected you. I'm going to replay later trying the silent running method. If I'm detected passively I can only assume that there is some noise emission even on silent running. I come from SC / DW with the knowledge that all platforms emit noise all the time, to some extent, so it's merely a matter of the emitter being close enough to the listener before detection occurs; it was therefore highly unlikely that one could close on a vessel with listening gear unless acoustic conditions were very very bad.

02-10-10, 09:30 AM	#8
ryanglavin Samurai Navy Join Date: Jun 2009 Location: Evading that Hunter/Killer Group on my Tail Posts: 584 Downloads: 35 Uploads: 0	I wish someone put the Seawolf Class sub in SH3 to be compatible with GWX 3.0... Firing missiles while 20 miles away at a convoy would be hilarious...!

02-12-10, 06:52 PM	#9
G7eT2 Watch Join Date: Jan 2010 Posts: 23 Downloads: 70 Uploads: 2	From what I have read convoy escorts and patrol vessels did ping the entire time they were on duty, regardless of whether they suspected anything. Presumably the game does not model this because it would be incredibly annoying to have to listen to all the pinging anytime an asdic equipped vessel was close by. So you may actually be being detected by asdic initially rather than hydrophone effect, and the game then starts up the pinging sound effect to add to the atmosphere of being hunted. I could be wrong and will no doubt be made fully aware of the fact if I am.