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-   -   How did they detect me? (https://www.subsim.com/radioroom/showthread.php?t=187810)

mightymightychatham 09-13-11 04:21 AM

How did they detect me?
 
Yes, I know there's a million "How did they spot me?" threads, but I read through a heap of them and couldn't find an answer for this situation. I'm sure there's an answer in there somewhere, but help the new kid out, eh?

I came across a seven column convoy in February 1941 guarded by four frigates and a corvette. I've never seen one this big before so I'm rubbing my hands together with glee. My usual tactic for large convoys has been working quite well; get around in front, submerge in a postition which will put me in a position to be amongst the columns when the convoy passes but as far from the path of the escorts as possible. Then when the escorts have passed, pop up the periscope and line up simultaneous shots for front and rear torpedoes, let them loose, dive, evade the angry bees and go my merry way.

This time I misjudged it a bit and one of the frigates passed close by me whilst zagging. I was at 12 metres, silent running, engines off, zero knots. I was not even drifting. Periscope down all the way. Seas were as calm as they come. About 0250, so quite dark. I play with the "stealth bar" on; when it reached about 1000m from my boat (or thereabouts) the stealth bar went yellow-orange-red in about 20-30 seconds. There was no pinging sounds. I was not using time compression. As soon as the stealth meter went red, the frigate changed course and then began pinging me.

Of course, his buddies joined the hunt and I was forced to dive and evade. Eventually I lost them but by the time I was able to resurface, the convoy was close to the continental shelf; I would not be able to catch it in deep water and I didn't fancy trying to lose up to five escorts in shallow water. So the seven column convoy steamed peacefully away into the rising sun as I cursed my luck and continued to my patrol sector.

How did he find me? Some new technology I'm not aware of? Or is there an obligitory minimum detection distance? From memory I've laid doggo that close to a destroyer once before and he just cruised past, albeit in mid-1940.

I use GWX and a few other graphic type mods. Any help would be appreciated!

Captain Nemo 09-13-11 05:18 AM

As the war progresses escorts become more efficient at detecting you whether submerged or surfaced. Calm seas also improves their ability to detect you. Even though you are running silent there is still a certain amount of noise coming from your boat to enable the escorts to find you. In the situation you describe, personally I would have tried a night surface attack over a submerged approach.

Nemo

JazzJR 09-13-11 05:28 AM

Quote:

Originally Posted by Captain Nemo (Post 1748953)
personally I would have tried a night surface attack over a submerged approach.

Nemo

As long they don't have Radar it is good to try a night attack. But it only works if it is a dark night without a visible moon. I often had, that the Escort spotted me 4000meters away! in a night. And if they light up their beams all ships do the same and you will get be depth charged to the death. I mostly hate these Flower classes. They are really annoying and will destroy your boat to 100% percent chance. :stare: I also used silent running and a lot of different stuff to avoid them, but is almost useless in 1941 and upwards.

Jimbuna 09-13-11 05:52 AM

Try never to leave your cross section side on to the escort, better to be pointed at them.

You may also have come across one of the elite crew status boats which does make them somewhat efficient...even though you were in 1941 there are some scripted in.

mightymightychatham 09-13-11 06:21 AM

Thanks all for the advice.


Quote:

Originally Posted by Captain Nemo (Post 1748953)
Even though you are running silent there is still a certain amount of noise coming from your boat to enable the escorts to find you.
Nemo

Thought it might be something like this. That would be the RL answer anyway, but I wondered whether the game behaved that way as well. Handy to know as I will be ditching the "stealth bar" soon to see how I fare.

Thanks again.

Captain Nemo 09-13-11 07:51 AM

Quote:

Originally Posted by JazzJR (Post 1748959)
As long they don't have Radar it is good to try a night attack. But it only works if it is a dark night without a visible moon. I often had, that the Escort spotted me 4000meters away! in a night. And if they light up their beams all ships do the same and you will get be depth charged to the death. I mostly hate these Flower classes. They are really annoying and will destroy your boat to 100% percent chance. :stare: I also used silent running and a lot of different stuff to avoid them, but is almost useless in 1941 and upwards.

I have a mod installed that takes away the search beams from merchant ships, which is how I understand it was in real life. This makes moving inside the convoy lanes a little bit easier, but as you point out, once the escorts have radar it is a much more difficult task.

Nemo

Fish In The Water 09-13-11 08:17 AM

Quote:

Originally Posted by mightymightychatham (Post 1748925)
I play with the "stealth bar" on; when it reached about 1000m from my boat (or thereabouts) the stealth bar went yellow-orange-red in about 20-30 seconds. There was no pinging sounds. I was not using time compression. As soon as the stealth meter went red, the frigate changed course and then began pinging me.

Just so you know, when the stealth bar lights up like a christmas tree, it's an indication that you're in danger of being spotted. Not that you necessarily have been. Hence the pinging after the bar went red. :sunny:

JazzJR 09-13-11 09:04 AM

Quote:

Originally Posted by Fish In The Water (Post 1749071)
Just so you know, when the stealth bar lights up like a christmas tree, it's an indication that you're in danger of being spotted. Not that you necessarily have been. Hence the pinging after the bar went red. :sunny:

Well if the bar stays red for more then one second it is too late and the hunt is opened! :arrgh!:

mightymightychatham 09-13-11 09:24 AM

Quote:

Originally Posted by Fish In The Water (Post 1749071)
Just so you know, when the stealth bar lights up like a christmas tree, it's an indication that you're in danger of being spotted. Not that you necessarily have been. Hence the pinging after the bar went red. :sunny:

Right. Didn't know that. I thought once it changed from green, I had been noticed, and the severity of the colour indicated how strong/accurate their reading was. As in; yellow - they know the general area/direction you are from them, red - they know more or less exactly where you are.

Rather, it's "potential" to be spotted. It all makes more sense now. Thanks all for the help!

yubba 09-13-11 09:28 AM

Ever consider this
 
http://www.youtube.com/watch?v=snBntragfnE

mightymightychatham 09-13-11 09:36 AM

I did actually, but since my crew are not a bunch of loveable misfits who somehow are able to work together to defeat a crack squad of a-holes who are using far better equipment, I counted it out.

Plus I never smelled nuthin.

JazzJR 09-13-11 10:25 AM

I also tried this once at a Convoy.
 
http://www.youtube.com/watch?v=_6yQZjX1uKU

and this to escape

http://www.youtube.com/watch?v=1L_kYJbcIrQ

HW3 09-13-11 04:07 PM

:k_rofl:

Good ones JazzJR

:up:

Jimbuna 09-13-11 04:24 PM

LOL :DL

Fish In The Water 09-13-11 08:04 PM

Quote:

Originally Posted by mightymightychatham (Post 1749095)
Rather, it's "potential" to be spotted. It all makes more sense now. Thanks all for the help!

You're welcome and good hunting! :sunny:


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