Hey I just noticed this: http://img7.imageshack.us/img7/2865/missmatch.th.jpg

why it's such huge missmatch between overlay and a ruler ?!

That tool I made definately DOESN'T allow a 10 seconds AOB fix. That can only be done by visual estimation, or maybe using the OLC Gui/U-jagd attack-periscope wheel. My tool takes quite alot of time to allow the bearing to move. Granted, the closer you are, the quicker it goes. But that also means things can get hecktic when you need to fire. I think it's better to use it to develop target course first. (and do the fixed wire method Hitman says in the meantime, IF the target is visual) Then use that to move ahead of the target at top speed.

If the target is still outside of visual range, I explain in this post (a bit, but in all honesty MittelWaechter made the image) how one can determine a (rough) figure for his speed:

http://www.subsim.com/radioroom/show...8&postcount=26

The problem is that for that to work you need a superb accurancy in the distance reading in BOTH measurements. If you can ID the ship positively and conditions permit a good measurement, of course you will get a decent solution. But the thing is, those parameters hardly ever happened in real life, nor in the game. Many times you have moderate seas that difficult the reading, or you identify wrong the target, or whatever. Therefore in real life same as in the game, the best thing is to do several measurements of distance and bearing and then average the results by drawing a line that goes through the center of them. That way you minimize errors, delays in the measurement (You can't always measure exactly when the clock hits the 3:15 point) and such.

True.. So I still in search for the best solution.

I need that U-jagd tool to try for GWX 3.0.

Downloading Pisce's Hydrophone Hunt tutorials now, will see what can I master of it

because the scale of the bearing overlay tool is adjusted to ONLY ONE scale zoom position. So-if you pressed +/- button a few times you would find a matching scale-but only to one zoom value. This tool should be used only to get accurate bearing NOT range-only the ruler tool of org. SH3 is getting adjusted to zoom scale-no matter of what zoom your are you will always get good range-1000, 2000, 2350 or any distance.

no Kranz ! the scale in Pato's image is in miles and the ruler is counting meters . (but for some reason ,that only Pato knows, he didn't consider that 1ml=1.852 km. he made his scale taking 1 ml = 1.55 km)

bye

Pisces, your tool is very good ! (need some tiny -tiny fixes at the scales , i don't know what formula you used to create the scales but here is what i used to check them : tan(aob)=sinA/(B-cosA) , where A=|b3-b1| and B=sin|b3-b2|/sin|b2-b1| )

congratulations !

Did someone mention Etchasketch’s AoB finder wheel?

By the way, good job on your "3-Bearing AOB Finder" wheel, Pisces:up:

cheers

according to what you say you should be always behind/ahead the difference between 1.852 and 1.55 so about 300 meters which is not true due to scale problem which I mentioned to be the most important reason why you shouldn't use bearing overlay to get range. Its scale works only for bearings, no matter where the mistake is.

There's no sine formula in there. It's:

1/tan(AOB1) = 1/tan(B2-B1) - 2/tan(B3-B1)

or

cotangent(AOB1)= cotangent(B2-B1) - 2* cotangent(B3-B1)

I know for sure the formula is correct. But please don't ask for the derivation. :damn:

Oh well, it's in this pdf (page 3-4): http://files.filefront.com/NOE+Beari.../fileinfo.html

i didn't say that your formula was wrong Pisces ! in fact ,my formula and yours is exactly the same thing ! (in trigonometry you can change from tangments to sines or coses but i bet you know that)
when i said that need tiny-tiny fixes i meant that in some cases the tools 'loose' 1-2 degrees.maybe is a false at printing.
of course this will never be noticable in the game.for that is very good.
i mentioned it only for the tool itself...you know to be....perfect!
bye

no Kranz,you still don't get it . you can use (if you want) the Pato's scale at any zoom.i said that what you see in scale is in miles,so when the target is at 1000 in pato's scale then the distance (in meters) is 1000 x 1.55 = 1550 m and this is what the ruler shows

here is the Pato's scale in meters:

http://i545.photobucket.com/albums/h...patometers.jpg

So I need that tool in kilometers then.

I think kranz was pointing to the idea that this overlay tool is still good for marking bearing of the target on the nav map. The sad point of it: it is in miles and ain't helping to get more accurate range to target.

You are right. Both formulas match after a bit of a sine/cosine/tangent juggling act. Hadn't done that yet until now. (note to self: pen on paper proofs perfectness)

Tell me about those imperfect marks please. I thought I had all of them fixed. Correct alignment of the centers of the disks is very important if you want the marks to line up.

Imho, plotting within 1.5 km is too short anyway. Maybe you can find a zoom level which makes a line of 15 km match with the 1.5 ring. Or you size up the image to make it that way with a graphics editing program.