Calculating speed close up with periscope

LaoHu · 08-04-23, 11:14 AM

I'm having issues with trying to get speed manually. I know that when you are close up to a target you can set the vertical line of the periscope to a place and record the time it takes for the ship to pass from bow to stern of it to calculate the speed but this did not work when I did it and the speed keeps registering as 0 kts. Am I doing something wrong?

stork100 · 08-04-23, 08:51 PM

Hi there,

I'm assuming your using the notepad method for manual targeting. From memory I think this is the procedure for speed:

1. Lock the scope onto the ship (L), identify the ship in the recognition book and click the tick icon in the book to send that data to the notepad.

2. Click the stopwatch icon in the notepad. Wait about 15-30 seconds and click again. You might have to do the range and angle on bow first though. Note that the scope needs to be locked on for it to work.

derstosstrupp · 08-04-23, 09:04 PM

Correct, you need range and AOB first. What’s happening is not what it seems - the game is calculating speed based on bearing change and not doing the “fixed-wire method” which times the transit of the vertical wire. This is clever of Ubisoft, as this was a method used as a backup (as was fixed-wire), albeit with a slide rule and not a magic notepad.

For that calculation, you need a range, an AOB, and time. 30 seconds to a minute should do it. And you need to keep the target locked in the scope as stork said.

LaoHu · 08-05-23, 12:57 AM

So more time measuring means more accuracy? I see now, thanks for the help guys

derstosstrupp · 08-05-23, 05:13 AM

At one point I did a writeup on how to incorporate the use of the notepad into a process, hopefully this helps too:

https://www.subsim.com/radioroom/sho...d.php?t=246723

08-04-23, 11:14 AM	#1
LaoHu Swabbie Join Date: May 2023 Location: Earth Posts: 13 Downloads: 15 Uploads: 0	Calculating speed close up with periscope I'm having issues with trying to get speed manually. I know that when you are close up to a target you can set the vertical line of the periscope to a place and record the time it takes for the ship to pass from bow to stern of it to calculate the speed but this did not work when I did it and the speed keeps registering as 0 kts. Am I doing something wrong? __________________

08-04-23, 09:04 PM	#3
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 887 Downloads: 489 Uploads: 0	Correct, you need range and AOB first. What’s happening is not what it seems - the game is calculating speed based on bearing change and not doing the “fixed-wire method” which times the transit of the vertical wire. This is clever of Ubisoft, as this was a method used as a backup (as was fixed-wire), albeit with a slide rule and not a magic notepad. For that calculation, you need a range, an AOB, and time. 30 seconds to a minute should do it. And you need to keep the target locked in the scope as stork said. __________________ Ask me anything about the Type VII or IX! One-Stop Targeting Shop: https://drive.google.com/drive/folde...WwBt-1vjW28JbO My YT Channel: https://www.youtube.com/channel/UCIJ...9FXbD3S2kgwdPQ

08-05-23, 12:57 AM	#4
LaoHu Swabbie Join Date: May 2023 Location: Earth Posts: 13 Downloads: 15 Uploads: 0	So more time measuring means more accuracy? I see now, thanks for the help guys __________________

08-05-23, 05:13 AM	#5
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 887 Downloads: 489 Uploads: 0	At one point I did a writeup on how to incorporate the use of the notepad into a process, hopefully this helps too: https://www.subsim.com/radioroom/sho...d.php?t=246723 __________________ Ask me anything about the Type VII or IX! One-Stop Targeting Shop: https://drive.google.com/drive/folde...WwBt-1vjW28JbO My YT Channel: https://www.youtube.com/channel/UCIJ...9FXbD3S2kgwdPQ

08-04-23, 08:51 PM	#2
stork100 Weps Join Date: Sep 2017 Location: Australia Posts: 352 Downloads: 92 Uploads: 0	Hi there, I'm assuming your using the notepad method for manual targeting. From memory I think this is the procedure for speed: 1. Lock the scope onto the ship (L), identify the ship in the recognition book and click the tick icon in the book to send that data to the notepad. 2. Click the stopwatch icon in the notepad. Wait about 15-30 seconds and click again. You might have to do the range and angle on bow first though. Note that the scope needs to be locked on for it to work.