For those that may be having trouble with the attack disc, there is an alternate method of calculating the target's course and speed. (Manually). Take a range reading from your watch officer and note both the range and bearing. (Start your stopwatch here). Use the protractor with the pivot at your ship, and make the bearing marking just like in the tutorial. Draw a line from that pivot point to the range estimated by your watch officer, make a mark at the end there. (just like was done in the tutorial with the small tanker). Once thats done, wait a specified number of minutes.. I use 5, get range and bearing again from your watch officer (Stop the stopwatch here) and do your drawings again, making a second mark. Then just draw a line between the two, and it will give you both speed and course of your target. If you use anything other than 3.15 minutes, you must use the conversion chart that comes with GWX 1.03, or do the math conversion km to knots. If you use 3 minutes 15 seconds, then distance = knots.
The attack disc allows you to get the target course in one measurement, while the manual method gets you both with 2. Rinse and repeat to refine or check for accuracy.
If you're in periscope view, obviously do the range manually, and note your degree's in periscope view. (bearing.) Taking these steps further you can actually plot a spot to attack your target at a pre-arranged position, which allows you to have all your data, including AoB, set before you even raise the periscope. (basically leading the target.)
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