Target Speed and Direction finding

Yahoshua · 10-30-06, 08:59 PM

I think I've found a way to determine target speed and direction from long-distance via sonar contacts, but I haven't tested this method extensively:

Step One: When you get a contact via sonar, mark the direction it is in bearing to your U-boat on the nav map (one on the uboat itself and one to mark the bearing).

You'll have to compensate for direction to true N. by 360 - bearing to contact (add 360 if a neg. number) = protracter dilineation.

Then use your compass to make a circle out to 20 km (long distance) 10 km (medium range) and closer than that you should be able to spit on it.

Start the stopwatch.

Step Two: Draw a protracter line through the two marks you put down on the map out to the circle and put another mark there. One going the direction of the U-boat, and the other connecting the marks.

Stop the clock at 3:15 sec.

Repeat steps 1 and 2 to get the next set of markings. Use the Nomograph mod (I think wazoo made it? Not sure on this) to get the speed of your target, and draw a line using the ruler to get the approximate direction of the target.

Then you can set a course for interception.

raduz · 10-31-06, 04:06 AM

i dont understand the purpose of these two circles of 20 and 10 km. could you explain how did you determinate that the medium range is 10 km?

zzsteven · 10-31-06, 04:26 AM

Short range= 0 - 1000m
Medium range= 1001 - 3000m
Long range= 3001 -20,000m

This is found in contacts.cfg

He draws the circle at 10000m because anything closer should be in viewing range, or close to it.

zz

joea · 10-31-06, 04:36 AM

Trying this tonight or sometime.

Thanks for the tip.

10-30-06, 08:59 PM	#1
Yahoshua The Old Man Join Date: May 2006 Posts: 1,493 Downloads: 0 Uploads: 0	Target Speed and Direction finding I think I've found a way to determine target speed and direction from long-distance via sonar contacts, but I haven't tested this method extensively: Step One: When you get a contact via sonar, mark the direction it is in bearing to your U-boat on the nav map (one on the uboat itself and one to mark the bearing). You'll have to compensate for direction to true N. by 360 - bearing to contact (add 360 if a neg. number) = protracter dilineation. Then use your compass to make a circle out to 20 km (long distance) 10 km (medium range) and closer than that you should be able to spit on it. Start the stopwatch. Step Two: Draw a protracter line through the two marks you put down on the map out to the circle and put another mark there. One going the direction of the U-boat, and the other connecting the marks. Stop the clock at 3:15 sec. Repeat steps 1 and 2 to get the next set of markings. Use the Nomograph mod (I think wazoo made it? Not sure on this) to get the speed of your target, and draw a line using the ruler to get the approximate direction of the target. Then you can set a course for interception. __________________ Science is the organized unpredictability that strives not to set limits to mans' capabilities, but is the engine by which the limits of mans' understanding is defined-Yahoshua

10-31-06, 04:06 AM	#2
raduz Engineer Join Date: Sep 2006 Location: Slovakia Posts: 205 Downloads: 3 Uploads: 0	i dont understand the purpose of these two circles of 20 and 10 km. could you explain how did you determinate that the medium range is 10 km?

10-31-06, 04:26 AM	#3
zzsteven Chief Join Date: Feb 2001 Posts: 319 Downloads: 0 Uploads: 0	Short range= 0 - 1000m Medium range= 1001 - 3000m Long range= 3001 -20,000m This is found in contacts.cfg He draws the circle at 10000m because anything closer should be in viewing range, or close to it. zz

10-31-06, 04:36 AM	#4
joea Silent Hunter Join Date: Jul 2002 Location: At periscope depth in Lake Geneva Posts: 3,512 Downloads: 25 Uploads: 0	Trying this tonight or sometime. Thanks for the tip.