sub tuto 1.4 : issue contact precision

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sub tuto 1.4 : issue contact precision

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sub tuto 1.4 : issue contact precision - 11/26/2018 8:17:42 PM

davidoux

Posts: 60
Joined: 11/28/2014
Status: offline

Hi All,

in subtuto 1.4 , i found the contacts very chaotic and unreliable, impossible to plot
a potential direction for the target altought i am full stop at almost periscope depth

https://i.imgur.com/Zz1Qhuu.png

looks like it's going "backward" sometimes, is there anything I am missing or is it the expected behaviour ?

< Message edited by davidoux -- 11/26/2018 8:28:55 PM >

Post #: 1

RE: sub tuto 1.4 : issue contact precision - 11/26/2018 8:44:45 PM

1nutworld

Posts: 365
Joined: 4/13/2014
Status: offline

I may be wrong but I think what you are "seeing" with the contact, is the ambiguity of the contact, as it your crew hasn't been able to classify many details, such as course and speed, as well as defining what ship it is.

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RE: sub tuto 1.4 : issue contact precision - 11/26/2018 9:17:06 PM

dcpollay

Posts: 532
Joined: 11/22/2012
From: Upstate New York USA
Status: offline

Just from your picture, it looks like the contact is a long ways away. It will take awhile for your crew to pin down its course, speed, range, and classify it, if they can at all. In fact, you may not even be able to detect the contact at all from that far away, except for the target's own very loud active sonar emissions.

The water in between you and the contact can distort the signal significantly, and make it seem closer or farther, louder or quieter, and make the bearing of the contact vary. Try looking through a water glass with the water sloshing, and see how the view changes.

To really pin down the target, they would probably need to be within at most 10-15 miles. From your distance, the contact will bounce around the map a lot based upon the uncertainty.

Edit: Oh yes, also, targets are usually easier to track if your own ship is in motion. You can more easily gain "parallax" angles for triangulation. And try varying your depth; sometimes the signal carries better from different depths. Get away from the surface waves, but tracking a surface vessel, you would want to stay above the layer as long as you are out of his active sonar range.

Sonar tracking is a long, slow, patient process.

< Message edited by dcpollay -- 11/26/2018 9:24:08 PM >

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RE: sub tuto 1.4 : issue contact precision - 11/27/2018 1:33:42 AM

CV60

Posts: 992
Joined: 10/1/2012
Status: offline

quote:

Sonar tracking is a long, slow, patient process.

ASW=Awfully Slow Warfare

(in reply to dcpollay)

Post #: 4

RE: sub tuto 1.4 : issue contact precision - 11/27/2018 2:05:25 AM

Rory Noonan

Posts: 2816
Joined: 12/18/2014
From: Brooklyn, NY
Status: offline

It's not very clear on mobile but that image seems to show the contact outside of your sonar range ring. Is it possible this is an ESM contact?

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Post #: 5

RE: sub tuto 1.4 : issue contact precision - 11/27/2018 11:02:13 AM

Dimitris

Posts: 13282
Joined: 7/31/2005
Status: offline

Nah, it's a ping-intercept (note the "LF sonar" emitter description above the contact). Given the context of the scenario, that's probably the Knox frigate coming towards you. IIRC this is the tutorial where you have to make use of the shallow bottom in order to mask yourself against the frigate's active sonar.

Ping-intercept detections, like all passive sonar detections, are ambiguous on location. You have to give them time to refine the uncertainty area. Given that the frigate is coming towards you this probably won't take long.

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