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joegrundman · 10-11-07, 09:31 PM

But that, as you say, is cheating.

If you don't play with map contact updates on then there are two ways of doing this.

One is to perform target motion analysis which is a little complicated, and requires you to be stationary which risks losing your opportunity to get a kill

the other way, which i use, is elaborated in a file you can get from my sig. It works best if you have built yourself a Submarine Attack course finder whiz wheel.

However if you haven't got a SACF, nor the patience to build one, here's how to do a simple version. You need to print yourself the table below.

Once you have made sonar contact go to medium speed and turn to point exactly at the contact direction.

Listen to the bearing of the contact. If the bearing to it decreases, it is going to show you its port side, if it increases, it will show you its starb'd side.

Once you have determined that, turn 90 degrees to port or starb'd accordingly and try to bring the target exactly on your 90/270 degrees.

Start the chronometer. You want to adjust your speed so that over a period of 3 or 4 minutes, the bearing to the target hasn't changed.

You are now on a collision course and will eventually meet the target.

Now pay attention to other details to obtain a rough speed estimate. Is the target travelling at slow, medium or fast speed, is it a warship or a merchant? Have there recently been radio contacts advising of a ship in the vicinity? USe this information to gain an estimate of the target speed.

You can then estimate the AOB of the target for your speed esitmate using this table. Do this for a couple of different speed estimates, and you have an approximate target course by the usual method of converting AOB to course!

Sub speed
x --------------3kts ----4kts---- 5kts ----6kts ----7kts
Target speed

5kts ----------AOB37 ---53 ------90 --------------- -
6kts------------ 30 -----42------ 56 -----90 ---------
7kts------------ 25 -----35------ 46 -----59------ 90
8kts ------------22 -----30 ------39----- 49 ------61
9kts ------------19 -----26 ------34 -----42------ 51
10kts -----------17 -----24 ------30 -----37 ------44
11kts -----------16 -----21 ------27 -----33 ------40
12kts -----------15 -----20 ------25 -----30 ------36
13kts -----------13 -----18 ------23 -----27------ 33
14kts -----------12 -----17 ------21 -----25 ------30
15kts -----------11.5 ---15 ------19 -----24 ------28
16kts -----------11----- 14 ------17----- 22 ------26

10-11-07, 09:31 PM	#6
joegrundman Ocean Warrior Join Date: May 2007 Posts: 2,689 Downloads: 34 Uploads: 0	But that, as you say, is cheating. If you don't play with map contact updates on then there are two ways of doing this. One is to perform target motion analysis which is a little complicated, and requires you to be stationary which risks losing your opportunity to get a kill the other way, which i use, is elaborated in a file you can get from my sig. It works best if you have built yourself a Submarine Attack course finder whiz wheel. However if you haven't got a SACF, nor the patience to build one, here's how to do a simple version. You need to print yourself the table below. Once you have made sonar contact go to medium speed and turn to point exactly at the contact direction. Listen to the bearing of the contact. If the bearing to it decreases, it is going to show you its port side, if it increases, it will show you its starb'd side. Once you have determined that, turn 90 degrees to port or starb'd accordingly and try to bring the target exactly on your 90/270 degrees. Start the chronometer. You want to adjust your speed so that over a period of 3 or 4 minutes, the bearing to the target hasn't changed. You are now on a collision course and will eventually meet the target. Now pay attention to other details to obtain a rough speed estimate. Is the target travelling at slow, medium or fast speed, is it a warship or a merchant? Have there recently been radio contacts advising of a ship in the vicinity? USe this information to gain an estimate of the target speed. You can then estimate the AOB of the target for your speed esitmate using this table. Do this for a couple of different speed estimates, and you have an approximate target course by the usual method of converting AOB to course! Sub speed x --------------3kts ----4kts---- 5kts ----6kts ----7kts Target speed 5kts ----------AOB37 ---53 ------90 --------------- - 6kts------------ 30 -----42------ 56 -----90 --------- 7kts------------ 25 -----35------ 46 -----59------ 90 8kts ------------22 -----30 ------39----- 49 ------61 9kts ------------19 -----26 ------34 -----42------ 51 10kts -----------17 -----24 ------30 -----37 ------44 11kts -----------16 -----21 ------27 -----33 ------40 12kts -----------15 -----20 ------25 -----30 ------36 13kts -----------13 -----18 ------23 -----27------ 33 14kts -----------12 -----17 ------21 -----25 ------30 15kts -----------11.5 ---15 ------19 -----24 ------28 16kts -----------11----- 14 ------17----- 22 ------26 __________________ "Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill Last edited by joegrundman; 10-12-07 at 10:21 AM.