New Hydrophone Interception Tutorial

[nefelodamon]

Thank you all for your nice words .

Actually I hope this will be only the first tutorial of more to come.
I want to perfect my technique with motion vectors (while in move) and also to demonstrate a convoy attack with that technique.

Now for the comments...

makman94

you don't need to draw the 20km radius circle at all ! only the four lines for the bearing and no matter how long they will be
i suggest to get the pato's image (the one that have circles till 4.650m radius--here: fixes+new 'one degree bearing') and directly place the bearing lines to the bearings that are given from sonarman (it will make your life ...easier

I like to draw the 20 km circle just to know the area of operations. I know it really does not adds to the technique but it helps me set a course to a good spot where I can have the 5th bearing ( a good spot relative to the 4th bearing line).

makman94

also for the last report of sonarman (the one that will give you the 'hot' 'fifth' bearing line is no need to come to a dead stop .when you get the report from sonarman...pause the game and draw the line to the given bearing
also,once you get the direction of the target and you want to turn your boat to a 90degrees angle course ,simply add (or minus--depends from if you have the target from your left or right of you) 90 to targets course and set your boat to this direction

That is up to any player to decide. Personally I dont like pausing the game at any time. Also the way to turn the boat at 90 degrees, I could find 10 ways to do that. Its always up to the player, and what comes handy that time.

makman94

and something for last , when you use the tdc and want to set the 90 aob ,be sure that your periscope is pointed to 0 degrees.anytime you will use the tdc ,always be sure first that the peri is pointing to 0 degrees (all this in case that your course is setted to a 90 degrees angle with target's course)

You are absolutely right on that. I miss that point. Periscope should always point at 0 degrees when making changes
Ευχαριστω καρντάση... Τα χαιρετισματα μου απο την μακρινη Ιρλανδια :-)


Pisces

Yes, I was just about to reply on this too. Look when he is going to set the tdc dials for the first time. He sets the AOB to 90. (adjusts range dial, but that is not important here) Then he sets the bearing dial to 000 (was set to 352 because of that course correction) Note how the AOB dial follows that movement. But then as he sets the tdc back to auto-mode the bearing dial flips back to the direction the (attack) periscope is looking (still 352), but the AOB dial doesn't follow. For this 90 degrees setup it doesn't matter much in accuracy. But for different AOB setups it could be alot worse.

The same as above. I should have been more careful with that. And it is true that the 90 degrees solution it self tolerates some error. But anyway, accuracy never hurts :-)

Contact

Imagine a frustration if you have external cams off and you get a sound contact and you do all that hard work just to find out you was hunting a neutral

Or a fishing boat
Propeller sounds its a must. Too bad that cannot implement in game. I was reading that the way the sound files are called for each boat is hard coded into the game :-(

Again thank you for the comments. I hope more videos will come soon :-)

[tomfon]

That was an excellent tutorial nefelodamon!
A clever way to intercept and sink a single ship. Really nice. Well done!
I'm waiting impatiently the video you said you'll make to demonstrate an attack to a convoy. This will be even more interesting.

Χαιρετισμούς.

[Pisces]

Nefelodamon:

I tipped the guys in the Sh4 forum about your tutorial. Keep an eye on that thread incase there are questions there aswell. Though I'll do my best aswel.

http://www.subsim.com/radioroom/showthread.php?t=154537

[nefelodamon]

Thank you Pisces. For sure I will keep an eye to that post for any queries might arise.

I started already working on the next tutorial. It will be about intercepting a target while your U-Boat moves.
It will be ideal for any targets that move away from your boat. Today on the train to work I had a nice idea on how to achieve that with only 4 bearings. It will involve a bit more plotting than the previous tutorial though ;-)

Again only with SH tools. I have the believe that SH provides everything necessary. No better WO than the ruler and protractor ;-)

This tutorial will include some vector work. I try to perfect the drawing technique as the scale confuse me a bit

I hope by Monday will be ready :-)

Thanks again!

[nefelodamon]

You can also view the tutorial here: http://nefelodamon.blip.tv/

The quality of video is amazing and is full length. I cant understand why people insist on youtube!!!

Greetings!

[Huliganul18]

When you put de 4 baring lines and whait for sonar to tell you the bearing (angle) after you copy the angle of his course.... there must be the target ?

on my first try my target is a little more long range than that point

[Pisces]

Originally Posted by Huliganul18

When you put de 4 baring lines and whait for sonar to tell you the bearing (angle) after you copy the angle of his course.... there must be the target ?

on my first try my target is a little more long range than that point

I don't completely understand what step in the procedure you are asking about.

- You first ask 3 bearings,

- From that you make the drawing for the target course. (just the direction of it, because you cannot know where he is yet, so you draw it at any range)

-Extend the line of the target course into the future. You predict where he will be a time interval after the 3rd bearing. And draw a 4th (imaginary) bearingline through it from the listening position.

- Right after that you move away quickly from where you were listening. surfaced. Either parallel course to the target (if he has passed you allready), or perpendicular to the last real bearing line (3rd, if you are still infront of him).

- When the interval between the 3rd bearing line and 4th imaginary line is about to pass you dive to do a hydrophone check. From your new position you draw the real 4th bearingline.

-The target is at the intersection of the imaginary 4th and real 4th bearing line.

I hope that makes it clear for you. Could you make a small drawing or screenshot if it wasn't?