Quote:
Originally Posted by ParaHandy
... (I'm ahead of the target at a 90 deg angle to his path so I assume it's 90 STB I enter) ...
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Look at the direction of the needle, and compare this to the direction the target moves through your view.
Quote:
Originally Posted by ParaHandy
That's a great thread, I'm going thru the stages now. One part I seem to come unstuck at is inputting the speed and range into the data notepad. I can input AOB fine ... but I can't seem to enter the other two pieces of data.
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If you use the notepad thing, then for entering range you need to first make sure the target has been properly ID-ed and first placing the line on the waterline, then using the stadimeter to put the line at the top of the target where the flag would be (due to rendering issues the flag or the ultimate top of the mast may not be shown, so you might need to guesstimate where it is.)
With the notepad you don't really measure speed. But you measure bearing drift angle. The stopwatch takes care of time. Using the previous values range and AOB the notepad 'computer' computes the distance the target has moved over this angle, and from that the speed over that period. For this to be accurate, range and angle on the bow needs to be accurate. Additionally, the bearing drift angle should not be chosen too small. The time period should be as long as is practical. Just a matter of seconds is not going to help accuracy in speed.
If you already know the speed and range through other means (plotting, or 'fixed wire' method) then it is easier to enter the values directly into the TDC dials on the Attack map screen (F6). First make sure you set the Auto-TDC switch to Manual. Then you can set the dials. Then set the Auto-TDC switch back and do your aiming business. Just realize that the range dial needs to be set for the moment of firing. It is not updated over time, in contrast to the AOB when you move the periscope. If you shoot perpendicular to the target track then the range doesn't change very much as the target gets close to the 90 degree AOB point (closest point of approach), compared to when it was further away with lower AOB. So you don't have to be really quick in setting it. And if you have plotted the target track then you can measure the minimal distance to the track, and enter that.