I even made a screeny during the planning phase but I accidentally left the time compression on so I couldn't make a second to show the near perfect result! I used the "Intercept method" from the French forum! I'll post screeny of planning phase any sec. I'm totally excited.

Edit: added screeny planning
http://i.imgur.com/zX70S8M.png

The main thing I didn't account for is that when my ship was at 4.5 Km from the victim, I submerged, so my speed slowed down a lot. I need to find the visual geometric trick to compensate for that. I'll make it my standard to dive at 5Km distance from enemy. Secondly... I need to adjust for the time I need to get to periscope depth from, say, 30 meter depth.

Edit 2: Right now hasing that guy and trying again. This time I try to compensate for the both the items I mentioned above (slow speed due to submerging and loss of time due to going back to periscope depth at slowest speed). I'll try with a threshold of 1000 meter (was 200m, total of 2000 meters distance from interception point).

Good job ! :yep:

Near perfection, almost creepy. I was a bit too harsh on self-criticism in my screenshot. Next practice: YellowFin's math. I'm almost jumping from excitement!
(Notice that I assumed my speed as follows because I slow down due to diving: ((real_speed + 8knots)/2 ) * 1.1

http://i.imgur.com/VsjS1h9.png

Also, I notice the stopwatch-method (3m:15s of recording) puts the automatic periscope speed estimation to shame. Learning as you go.

I am now as I type this. Just a quick note: I see you have no Anti Aliasing as well. I just fixed mine. You're not interested in that? Cheers.

Hey, thanks for your comment! Nice YT avatar btw :)

Is the aliasing the ugly fine lines that are shown as dashed lines, like the antennas and such? Yes, I'm very interested in fixing that.

The forumla beta = asin(v_g/v_e * sin(alpha)) will not work with that correction, it assumes true persistent speeds (at the time of the calculation) until interception. Or are you calculating an average with your correction?

I take from your posts that you look for an approach course when you are already in visual range of the target. I use the intercept course formula for intercepting a map contact from a B-Dienst message, e.g. when a convoy pops up at the other end of the grid square, or a grid square over from where I am patrolling. That means they're usually dozens if not hundreds of kilometers away. With the intercept course I get into a range of about 5-10 km from the target's supposed track and then the tedious work of determining its exact speed and heading begins (combined with getting into an attacking position).

My method:

1. Get map contact from B-Dienst or friendly u-boat
2. intercept using formula until about 5-10 km from supposed track
3. check horizon, usually I have the target abeam, either slightly ahead (if I used the calculation tel quel), or behind if I made sure to arrive early
4. if no visual of target can be obtained -> dive and try to get acoustic signal
5. If you are way too early hunt up supposed track surfaced with intermittent dives if visibility is bad until target is found. To decide whether you're behind or in front of target, check time of map contact, the correctness of your calculations and whether or not the target might have turned.
6. once found, overtake by 5-10 km, turn in to get 0° AOB and obtain exact heading
7. move off track by ~1.5 km and approach slowly on an opposite but parallel course
8. turn in for shot at 90° AOB

If you want to go for the perfect, well prepared 90° angle shot I recommend you overtake your target by ~10 km. You can go down to ~5 km at night or in bad visibility.

Tactical advice from the U.Kdt.Hdb. :

(I'm paraphrasing)

I still sometimes make the mistake of diving immediately after taking 0° AOB bearing. The smart thing to do is to speed up again (I usually slow down to make sure I don't miss exact 0° AOB) and take a position 1.5 km off track and turn for opposite but parallel course and then dive, because all this maneuvering while submerged takes a lot more time

In German engineering language we differentiate between dive-boats and submarines (ger. Untersee-), and according to this definition only types XXI and onward count as true submarines. Our U-boats (Type II, VII, IX) are meant to dive only for the actual attack and for evasion. They stay surfaced for most of the time.

I hope these tips are helpful. Have a nice weekend everyone!

When you first open Commander there is a blank slot at the bottom left. Put the cursor on it and it says "Leave blank for SH3 generated patrol grid." Type the grid you want into that slot.

I have only the day before yesterday solved mine. Here's the thread: http://www.subsim.com/radioroom/showthread.php?t=230507

For the first question, yes I use a guesstimated average taking submerged speeds into account. The formula is only to develop insight. Eventually the graphical interception method using Thale's theorem can be done on a whim. So everything becomes relative after practice and experience.

I have practiced with the B-radio map contact through bstanko's YT channel. I can find the target if it's not too far away. But the hydrophone is too in-accurate I noticed compared to visual acquisition for approach angle. But I'll check this comment again and see if I overlooked something.

Yes, I've found it. It wasn't blank, it revealed where my next assignment would be.