Target speed estimation

sdflyer · 03-08-10, 05:25 PM

What is the best way to estimate a target speed using manual TDC?
Are there formulas based on target's bearing change, distance and time?

Thanks!

sdflyer · 03-09-10, 01:02 AM

bump

Capt.Warner · 03-09-10, 01:04 AM

kylania · 03-09-10, 02:21 AM

Open your stopwatch
Mark the current position of a contact as close as you can
Start the stopwatch, after 3 minutes and 15 seconds...
Mark the current position of the contact as close as you can
Measure the distance between the two marks. Divide by 100 to get the speed in knots.

So if the distance was 800m they are traveling 8kts. If it was 1100m they are traveling 11kts

Step 1 & 2 & 3:

Step 4:

Step 5:

For Imperial users (huh??) only measure for 3 minutes.

03-08-10, 05:25 PM	#1
sdflyer Seaman Join Date: Mar 2010 Posts: 35 Downloads: 2 Uploads: 0	Target speed estimation What is the best way to estimate a target speed using manual TDC? Are there formulas based on target's bearing change, distance and time? Thanks!

03-09-10, 01:04 AM	#3
Capt.Warner Lieutenant Join Date: Apr 2009 Location: Somewhere in the Atlantic Ocean Posts: 262 Downloads: 60 Uploads: 0	http://www.subsim.com/radioroom/showthread.php?t=163971 Nuff Said. __________________

03-09-10, 02:21 AM	#4
kylania Silent Hunter Join Date: Aug 2006 Posts: 3,528 Downloads: 118 Uploads: 0	Open your stopwatch Mark the current position of a contact as close as you can Start the stopwatch, after 3 minutes and 15 seconds... Mark the current position of the contact as close as you can Measure the distance between the two marks. Divide by 100 to get the speed in knots. So if the distance was 800m they are traveling 8kts. If it was 1100m they are traveling 11kts Step 1 & 2 & 3: Step 4: Step 5: For Imperial users (huh??) only measure for 3 minutes. __________________ Last edited by kylania; 03-09-10 at 02:36 AM. Reason: Pretty pictures!

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03-09-10, 01:02 AM	#2
sdflyer Seaman Join Date: Mar 2010 Posts: 35 Downloads: 2 Uploads: 0	bump