View Full Version : Nav Chart accuracy question

10-05-2006, 08:36 AM
[I posted this question on another Forum. The guy were great, but I never got the answer I was looking for]

I am on my very first, 1939, patrol. As I am on my Patrol Grid, on the surface, riding the seas, I am patrolling in F5, Nav Chart, Time X 256. The seas are rough but when I go to F4 the visibility is good. A ship {square symbol} shows up just a few Km from me. I am more interesting in getting close enough to learn the TDC than anything else, at this time, so I change course and attempt to 'collide', reasoning that the ship is harmless. I can come very close before having to take evasive action. I have F5 in high magnification, a couple hundred meters per grid. The symbols merge. I NEVER see the ship! I ran back and forth across that square symbol, in daylight, and never saw a thing. How can that be ??

I have 'written this one off' and returned to my Patrol, but I am bewildered.

Any 'Ubi Forum' help here ??

10-05-2006, 08:44 AM
When you see a square come up that shows a ship. This means the first location where the ship was located. The ship will continue travel in its path. Things to look for are the direction of travel and speed. Kind of guage your U boat towards the direction the ship is heading to collide. When you do meet the ship. You should be able to zoom in on the map and the square will change to a boat shape and be moving. Hope this helps you.

Good hunting!!!

10-05-2006, 08:57 AM
So... are you saying that the square symbol for the ship does NOT show it's actual position as we both move in Time = X 256 ????

10-05-2006, 09:05 AM
Yes, tuddley drawed a nice scheme of how to intercept ships, maybe he would be so kind to post it again here.

*edit*. here's the thread, the picture is somewhere in them middle of the page


Hope this helps http://forums.ubi.com/groupee_common/emoticons/icon_smile.gif

10-05-2006, 09:33 AM
I think I got 'led astray' by the 'movement' of the Reported Ship Position on the F5 view as my own WAS moving.. appearing to 'come together'....

10-05-2006, 01:51 PM
The "box" you see from far away at first is a "single merchant radio report". Some other aircraft or u-boot is telling you it saw a ship there.

Once you get within about 16km or so the box you see at medium magnification will move as the ship moves however.

10-05-2006, 02:26 PM
Once you get within about 16km or so the box you see at medium magnification will move as the ship moves however.

That seems to be 'in dispute'...[sorry, not by me]. Somebody said that the status of The Ship was not 'updated'...therefore the movement of it in Time X 256 is ... haywire? I know for certain that I drove back and forth across that ship symbol and never saw a thing. And I mean I had the magnification up to where a single grid square was only a hundred METERS. Surely any ship large enough to 'count' would have leaped up at me, if the symbol was telling the instantaneous truth ???

I found another ship now, and I wont try to run it down.. I'll use calculations that I find here to compute an intersection. At least this one is 'Smoke in the binoculars'

10-05-2006, 08:40 PM
Thanks for remembering my hideous drawing Michiel_88. I think maybe I'll make a new one with GIMP. http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif

10-06-2006, 08:02 PM
http://forums.ubi.com/images/smilies/16x16_smiley-happy.gif It's hard drawing with a roller ball mouse.