Target speed calculation made easy

[MudMarine]

CaptFlunky and Others,
Ye Gads! Flunky ya not only one who slept through math. My favorite sim in the past was Silent Service II. The days of those simple sims are over. What we need is a Sub Sim School on line! :hmm: Guess I got to bone up on my math ,YuK! Heck ! I got problems just doin my Taxes! I will have to study this thread a lot and practice , practice and practice till it becomes second nature.

I have some other questions abour SH4 but those are for another thread.

[Powerthighs]

uhm nevermind, that method i just mentioned didnt work, i got too much of a bearing change for the speed to be correct..

So what you are saying, is that I have to check the bearing change by Visual Eyesight? How will I be able to see, with my own eyes, thru a periscope, at 1100 yards, if he changes his course by 3 degrees?

Getting frustrated again.. Ubi.. please fix the auto bearing finder..


S!

RH

RedHerring, not sure if anyone ever answered your question.

The change in bearing doesn't mean how the course of the target ship changes. It means the change in direction you look to see the target.

This is easily measured through the periscope. Let's say you see a ship moving left to right across your periscope view, 2000 yards away. You place your periscope centered on the middle of the ship. You see the periscope bearing is 270, (i.e. the target is directly to your left).

You wait 30 seconds, then move the periscope to re-center on the ship. Now the periscope bearing reads 275.

That means the bearing changed 5 degrees in 30 seconds on a target 2000 yards away. Looking at the chart, that gives you a speed of 10 knots.