Convoy interception using Yards

black1 · 12-20-07, 08:45 AM

http://www.subsim.com/radioroom/showthread.php?t=118988

I use to use this method before 1.4 and it worked great, I also used one just a bit differently as well using 1km for 1mile. Now in patch 1.4 the ruler is fixed and uses Yards instead of km's and im a bit confused trying to figure out convoy speeds. Ex: convoy is moving slow at 6knots, instead of before drawing a line with the ruler of 6nm like before, it is now using yards and it has become more difficult to understand what to do, I have a yard conversion chart, but, is there anyone who can explain, maybe using screenshots as an example like the old post for convoy interception with new patch 1.4 yards. This would be great for me and maybe others as well to understand. Thanks all for your help on these forums.

micky1up · 12-20-07, 08:56 AM

there are 2000 yds to a sea mile if a ship is doing six knots thats 12000 yds per hour or 1200 yds every six mins or 600 yds every 3 mins duz that help

jdkbph · 12-20-07, 09:16 AM

I know Micky1up just said this, but perhaps even simpler...

Mark the target's position and start the stop watch. Wait 3 minutes then mark it again. Measure the distance between the marks. Whatever the value (in yards), just drop the last two digits and that's the target speed in knots.

JD

black1 · 12-20-07, 10:09 AM

JDK thanks but i know how to get speed, i was wondering more like how to judge were i need to be ahead of the convoy to intercept them. The link i posted used km and now that has been fixed on the ruler by using yards. So when using ruler or protractor i have to use a bit different calculations in order to plot were i need to go to intercept the convoy or merchant. Thanks micky1up that does help and will use that rule of thumb. It still would be helpful for me and others if someone could post screenies of ther convoy/merchant interception using the new yards system with 1.4.

Fincuan · 12-20-07, 10:26 AM

The scale doesn't really matter in the above method, just pick one that is convenient. If you used to draw a line of one nm for every knot before, you can now use 1000 yards or meters or one kilometer, and the result is the same. Yards, naval miles, meters, kilometers all do the job equally, as long as you use the same with all the lines and circles.

black1 · 12-20-07, 12:31 PM

Ok makes sense, thanks for the info.

micky1up · 12-20-07, 01:57 PM

i dont find the approach a problem maybe its my background i judge by eye which way to head and if the contacts not in sight i listen to which way the sonar contact is heading and adjust my heading to intercept

Rockin Robbins · 12-21-07, 02:51 PM

Although the scale doesn't matter, it does matter if you mix scales in the same diagram! Your ruler will do just that if you don't watch it. All distances under 5 miles are rendered in yards and anything more is nautical miles. Then you have mixed units and irrelevent results until you normalize the scale to all nm or all yds.

DANGER WILL ROBINSON!

Munchausen · 12-21-07, 03:32 PM

If you're trying to intercept the standard map contact (outside of visual and sonar range), it will most likely be more than five nautical miles away. Since your boat still travels in knots (same as in SH3), your intercept geometry should be the same.

If you're trying to set up for an attack on a visual target, your projected offset distance should be in yards (unless you plan to fire your fish from the safe distance of 5nm). Although they aren't exactly the same length, yards and meters are close enough so that, if you fired at 1000 meters in SH3, you should do just fine firing at 1000 yards in SH4.

If you're worried about visual detection range ... well, it could be inside or outside the cutoff between nautical miles and yards, depending on the weather and time of day. Ergo, it's a bit of a turkey shoot.

12-20-07, 08:45 AM	#1
black1 Ensign Join Date: Nov 2007 Posts: 225 Downloads: 6 Uploads: 0	Convoy interception using Yards http://www.subsim.com/radioroom/showthread.php?t=118988 I use to use this method before 1.4 and it worked great, I also used one just a bit differently as well using 1km for 1mile. Now in patch 1.4 the ruler is fixed and uses Yards instead of km's and im a bit confused trying to figure out convoy speeds. Ex: convoy is moving slow at 6knots, instead of before drawing a line with the ruler of 6nm like before, it is now using yards and it has become more difficult to understand what to do, I have a yard conversion chart, but, is there anyone who can explain, maybe using screenshots as an example like the old post for convoy interception with new patch 1.4 yards. This would be great for me and maybe others as well to understand. Thanks all for your help on these forums.

12-21-07, 02:51 PM	#8
Rockin Robbins Navy Seal Join Date: Mar 2007 Location: DeLand, FL Posts: 8,900 Downloads: 135 Uploads: 52	CAVEAT Although the scale doesn't matter, it does matter if you mix scales in the same diagram! Your ruler will do just that if you don't watch it. All distances under 5 miles are rendered in yards and anything more is nautical miles. Then you have mixed units and irrelevent results until you normalize the scale to all nm or all yds. DANGER WILL ROBINSON! __________________ Sub Skipper's Bag of Tricks, Slightly Subnuclear Mk 14 & Cutie, Slightly Subnuclear Deck Gun, EZPlot 2.0, TMOPlot, TMOKeys, SH4CMS

12-20-07, 08:56 AM	#2
micky1up Captain Join Date: Nov 2002 Location: helensburgh Posts: 525 Downloads: 2 Uploads: 0	there are 2000 yds to a sea mile if a ship is doing six knots thats 12000 yds per hour or 1200 yds every six mins or 600 yds every 3 mins duz that help

12-20-07, 09:16 AM	#3
jdkbph Captain Join Date: Mar 2007 Posts: 508 Downloads: 104 Uploads: 0	I know Micky1up just said this, but perhaps even simpler... Mark the target's position and start the stop watch. Wait 3 minutes then mark it again. Measure the distance between the marks. Whatever the value (in yards), just drop the last two digits and that's the target speed in knots. JD

12-20-07, 10:09 AM	#4
black1 Ensign Join Date: Nov 2007 Posts: 225 Downloads: 6 Uploads: 0	JDK thanks but i know how to get speed, i was wondering more like how to judge were i need to be ahead of the convoy to intercept them. The link i posted used km and now that has been fixed on the ruler by using yards. So when using ruler or protractor i have to use a bit different calculations in order to plot were i need to go to intercept the convoy or merchant. Thanks micky1up that does help and will use that rule of thumb. It still would be helpful for me and others if someone could post screenies of ther convoy/merchant interception using the new yards system with 1.4.

12-20-07, 10:26 AM	#5
Fincuan Admiral Join Date: Aug 2007 Location: Suomi, sauna, puukko, perkele Posts: 2,346 Downloads: 39 Uploads: 0	The scale doesn't really matter in the above method, just pick one that is convenient. If you used to draw a line of one nm for every knot before, you can now use 1000 yards or meters or one kilometer, and the result is the same. Yards, naval miles, meters, kilometers all do the job equally, as long as you use the same with all the lines and circles.

12-20-07, 12:31 PM	#6
black1 Ensign Join Date: Nov 2007 Posts: 225 Downloads: 6 Uploads: 0	Ok makes sense, thanks for the info.

12-20-07, 01:57 PM	#7
micky1up Captain Join Date: Nov 2002 Location: helensburgh Posts: 525 Downloads: 2 Uploads: 0	i dont find the approach a problem maybe its my background i judge by eye which way to head and if the contacts not in sight i listen to which way the sonar contact is heading and adjust my heading to intercept

12-21-07, 03:32 PM	#9
Munchausen Commodore Join Date: Jul 2002 Posts: 608 Downloads: 25 Uploads: 1	If you're trying to intercept the standard map contact (outside of visual and sonar range), it will most likely be more than five nautical miles away. Since your boat still travels in knots (same as in SH3), your intercept geometry should be the same. If you're trying to set up for an attack on a visual target, your projected offset distance should be in yards (unless you plan to fire your fish from the safe distance of 5nm). Although they aren't exactly the same length, yards and meters are close enough so that, if you fired at 1000 meters in SH3, you should do just fine firing at 1000 yards in SH4. If you're worried about visual detection range ... well, it could be inside or outside the cutoff between nautical miles and yards, depending on the weather and time of day. Ergo, it's a bit of a turkey shoot.