Manual torpedo targetting

# How to manualy calculate torpedo course

To calculate speed we ned to know time and distance, as theese two combined defines the messurment of speed (Se below). I use SI-units in this article to calculate the speed in knots. Pictures and illustrations to come!

### Using NPC's

While this is not manual targeting, it is a viable option as they are able to do usable calculations at the cost of time.

In the map view:

* select a target

*(insert image)*

* click on the target option

*(insert image)*

* select 1 or 2 sailors to start targeting calculations.

*(insert image)*

* wait for the calculation to reach 85% or more, then fire the torpedo.

> To update the NPC calculation, select the field in question (range, speed, angle), mark the text, press delete then enter to get an updated value.
>
>

## Using Map tools and Math

Mark the starting point at the front of your target

*(insert image)*

Wait 3minutes and 15 seconds (3:15), then mark the end point in front of the vessel.

*(insert image)*

mesure the distance and the speed is roughly eaqual to the distance divided by 100.

*(insert image)*

eksample:

if the boat has traveled 560 meters in 3:15, the speed is aprox 5.6 knots.

> 560/100 = 5,6
>
>

Using the fomula below we can confirm this.

k
n
o
t
# s

(

560
m

195
s

0.514
m

/

s

)

{\displaystyle knots = \left (\frac {\frac{560m}{195s}}{0.514 m/s } \right)
}

= 5.5871 knots.

**Lite\_ly Salted** has a tutorial on how to use this method on youtube!

## Using Math like a real sailor!

We can easily calculate the speed of a vessel with a basic physics method and the simple map tools and a cronometer (clock). But why should we use this method instead of the previous method? You obviously do not have to, as the "simple" method also gives a precise enough ansver for the game. But do you realy want to wait 3 minutes and 15 seconds to findout? How about using a little math, 15 seconds of waiting time and be done long before the "simple" users?!

We will be using the mathmathical equation for

Δ
V

{\displaystyle \Delta V}

 (delta v, wich means average velocity), and our knowledge about the nauticalmile standard and the knot metric. For those that dont know, a nautical mile is eaqual to 1852 meters, and a knot is nauticalmiles traveled per hour. So 1 knot = 1852/60 minutes!

### The "Physics" formula

Δ
V

{\displaystyle \Delta V}

 (delta-v)

How we calculate delta-v is simply by dividing difference in distance traveled by the difference in the time it took to travel the distance.

To put it technical:

Δ
v

{\displaystyle \Delta v}

 =

Δ
m

Δ
s

{\displaystyle \frac{\Delta m}{\Delta s}

}

 =>

m
2

−

m
1

s
2

−

s
1

{\displaystyle \frac{m\_2-m\_1}{s\_2-s\_1}
}

Using this formula we can also figure out how fast a knot is in the SI-unit (m/s) by simply dividing a nauticalmile by one hour in seconds. One hour is 3600 seconds ( 60 minutes \* 60 seconds).

1 knot =

1852
m

3600
s

=
0.514
m

/

s

{\displaystyle \frac{1852m}{3600s} = 0.514 m/s
}

> This number is important going forward, as we need that to konvert our calculations to the knots we will enter in to the game.
>
>

### Calculating knots

To use the above formula for delta-v in game we obviously need some ingame data, the funn part is that the data only need to be long enough that you are able to collect the data. (Remember to use spacebar to pause the game while you take notes) .

The data we need:

* Distance in meters
* time in seconds

1. First pause the game, and set the starting point of your messurement (

m
1

{\displaystyle m\_1 }

),

*(insert image)*

2. Unpause and start your timer at the same time (

s
1

{\displaystyle s\_1}

 ).

3. When you have reached the desired time (

s
2

{\displaystyle s\_2}

), stop the clock and pause the game at the same time!

Mark the end point (

m
2

{\displaystyle m\_2 }

 )

*(insert image)*

4. Mesure the distance between

m
1

{\displaystyle m\_1 }

 and

m
2

{\displaystyle m\_2 }

 using the ruler maptool .

*(insert image)*

> (I reccomend using atleast 15 seconds to do the messurment, as you need to be able to click around fast enough)
>
>

To calculate the knots we use the folowing fomula:

k
n
o
t
# s

(

d
i
s
t
a
n
c
e

s
e
c
o
n
d
s

0.514
m

/

s

)

{\displaystyle knots = \left (\frac {\frac{distance}{seconds}}{0.514 m/s } \right)
}

For the purpose of this tutorial, i use theese messurments: *(will update to match pictures)*

* distance = 100 m
* time = 15 seconds

My formula looks like this:

k
n
o
t
# s

(

100
m

15
s

0.514
m

/

s

)

{\displaystyle knots = \left (\frac {\frac{100m}{15s}}{0.514 m/s } \right)
}

 = 12,97 knots
protip: use a spreadSheat like excell to do the calculations!

**protip**: use a spreadSheat like excell to do the calculations!

All you need to do is insert the formula below, change the [distance] and [time] to reference the respective cells, Voila!

```
=([distance]/[time])/0.514

```