New Hydrophone Interception Tutorial

[nefelodamon]

Hello all,

After playing a while, I got fascinated by the idea of intercepting and shooting at targets only with the use of Hydrophone.

So after a lot of reading, watching other tutorials and videos I present you my version of Hydrophone interception.

DL here: http://www.filefront.com/14186971/Hy...mon.part01.rar
View here: http://nefelodamon.blip.tv/

As I state at the end of my video, I dont claim that I re-invented the wheel. On the contrary, I used information available around the internet and here, at subsim.
My tutorial was inspired by the excellent video of Mittelwaechter called ''Hydrohunt''. I used his method of "4th bearing" position calculation as he describes it on his videos.

I hope you will enjoy my tutorial and that more users will turn to manual targeting

[Mittelwaechter]

Ooh! - That's a brilliant and easy technique to get the course direction of the contact.

Whoever is interested in hunting by hydrophone should watch this clip and learn the magic of the technique.

Well done Sir!

[Pisces]

My sentiments exactly!!!

A minor suggestion if you need to copy over parallel lines (or the moved distance of the target between the bearings) is to use the arrow of the compass. When you move the circle elsewhere on the map the arrow points in the same direction. I find that easier than setting up a new protractor with the same angle value, as it also has the added chance of inaccurate angles.

[meduza]

Thanks for the tutorial!

[makman94]

very nice video Nefelodamon ! bravo !

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)
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
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 made a great video !

bye

[Pisces]

Originally Posted by 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)
...

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.

[Canovaro]

Best Hydrokill I have ever seen! Very well done.
Great video too! I have a drawing on how to do it but a video is more practical.

Thank you for making it available.

[Dissaray]

Damn, looks like I am going to have to take another page of notes, makes three now. All these smart people keep making these fancy vidios about how best to use all these toys and I think, "OOOOO I got to try that one out."

Befor I saw that I didn't think the hydrophone was much good to me, just a good tool for making a pre-scope check if there are any baddies about. Now I might actualy have to kill some thing with it. I also didn't know you could shoot from that deep, what is the maximum depth for shooting anyway?

[Wilcke]

Here is a great tool that use quite often! The developer has his own thread here on SubSim.

http://www.subsim.com/radioroom/down...do=file&id=648

[=FI=Ghost]

Excellent tutorial mate, I am looking forward to try it out in practice. I have a question tough.

When you start drawing the first 3 bearing lines, what is the minimum difference in bearing between first two observations in order to start drawing the lines? To clear things out, your second observation after 5 minutes showed less than 10 degrees difference in bearing, so you waited another five, and then another five. So I guess it has to be at least 10 degrees difference between first two observations? Am I right?

[KL-alfman]

I've worked with nefelodamon's method for some time now (thx again for the tutorial!).

still have problems with the drawing when the target's bearings change only slightly and the target is moving away. most of the time I then surface and try to get into a better (and nearer) position and start again with the readings.
I also do prefer a difference of more than 8° in the various readings, because it's easier to draw the lines and circles on the nav-map. if the target is closing to your position there's no problem to expand time for the different readings, imo.

[Paul Riley]

All this is just what I have been looking for.Nice to have that extra string in your bow.
Thanks to all involved.

[Stavros]

Thanks nefelodamon, very useful video

[Pisces]

For those that need some papers in their hands to understand this technique. Worry no more!

http://www.subsim.com/radioroom/showthread.php?t=160817