Calculating enemys course

[Kumando]

Hi felow Kaleuns, do you know other quick method to calculate the enemys course rather than the 3:15 rule?

[Zero Niner]

What's the 3:15 rule?

[firepower41]

Originally Posted by Kumando

Hi felow Kaleuns, do you know other quick method to calculate the enemys course rather than the 3:15 rule?

That method is for speed in knots, not course, I think, mate.

[Kumando]

Originally Posted by firepower41

That method is for speed in knots, not course, I think, mate.

You can also determine the course with the ruler tool using this rule but i want to learn a more effective method.

[Mooncatt]

i guess and its usually right

[Kumando]

Can someone answer my question please?

[Mooncatt]

Originally Posted by firepower41

That method is for speed in knots, not course, I think, mate.

its has mate

[Kumando]

I forgot to mention that im not using contact updates on map.

[Abd_von_Mumit]

The 3.15 prooved to be the most effective methods that I ever used. I've modified it to be rather 6.30 method or even 13.0 method, though it's still the same one, regardless it's multiplied. It's deadly accurate/precise and very easy to use (after you learn it ang catch the skill).

[Kumando]

Originally Posted by Abd_von_Mumit

The 3.15 prooved to be the most effective methods that I ever used. I've modified it to be rather 6.30 method or even 13.0 method, though it's still the same one, regardless it's multiplied. It's deadly accurate/precise and very easy to use (after you learn it ang catch the skill).

Additionally with no map contact update on, i also play with no sub icon on map so the 3:15 rule doesnt really suits me well.

[Nikita]

Use this http://www.paulwasserman.net/SHIII/WazooNomoModBig.rar. The nomograph lets you pick up speed and course in just 30 seconds.

Well, really just for speed and range, but if you pick up two ranges in 30 seconds (more time better), you get the course.

[Kumando]

Originally Posted by Nikita

Use this http://www.paulwasserman.net/SHIII/WazooNomoModBig.rar. The nomograph lets you pick up speed and course in just 30 seconds.

Well, really just for speed and range, but if you pick up two ranges in 30 seconds (more time better), you get the course.

I used the draggable version before and it was very usefull, but since i removed the sub icon from the map i cant make the nomograph to show on the map no more.

Distance in Kmeters x 32.5 divided by minutes = knots
Or distance in meters x .0325 divided by minutes = knots

Plot target's first position and begin timer. Plot subsequent positions and plot target's general course. Measure distance traveled and note minutes on timer.

For example 2.6 Km x 32.5 divided by 12 minutes = 7.0416 knots

The more observations and calculations you make, the more accurate your estimation of speed.

This is really useful with a target on a zig-zag course.

[Nikita]

Originally Posted by Kumando

I used the draggable version before and it was very usefull, but since i removed the sub icon from the map i cant make the nomograph to show on the map no more.

Use the fixed nomograph, vertical or horizontal.

Originally Posted by Kumando

Hi felow Kaleuns, do you know other quick method to calculate the enemys course rather than the 3:15 rule?

3:15 rule is not to get course, but rather speed. As the distance between plots made with 3 min 15 sec's seperation is equal to speed in knots/10. So make the plots seperated with 3:15 and measure the distance between plots in meters. Now multiply that with 10 and voila - Knots.



Now if you ARE looking for target Course

Then that realy depends on what info you have available on the target at hand.



1---
You could use the whizwheel if you have
A) own sub's heading B) Bearing to target C) AoB

2---
a Second method is simply plotting it from WO's calls - never mind the time seperation as you dont need speed to have course from the plot.

3---
the third and most dificult way (also not very WWII'ish) is TMA on hydrophone plots. TMA = Target Motion Analysis. This is VERY dificult and time consuming, but if your a NERD i guess it could be a fun and tormenting study. Hit words for Google would be Ekelund Range, TMA, Geo-plot, one-bearing only. I'm simply do not know enough about this to be able to tell you about it my self.


As for the plotting it self - mummit is 100% right. You dont need jack but a paper and a set of rulers to plot. Make a north arrow on the paper - now make a line that has your sub's course. Now make small hacks on that line with the interval in scale that your sub at current speed will travel in 3 min 15 sec's. Make lots of hacks.

Take a bearing Range reading of the target - start the stopwatch and then plot that at the first hack. As the stopwatch comes to 3.15 make the next plot from the second hack. At 6.30 the thired plot from the thired hack etc etc etc. Soon the target plots will show a direction - connect the dots and voila - course. Now measure the speed from the plot spot distances. If your a tad clever you can now "draw ahead in time" your own approach to the shooting spot and then be sure to follow that planed rout's headings and speed's. When you arrive on the shoot spot you can make a couple of extra plots on the target just to be sure that he is STILL going the same speed and heading.