Pato's fixed bearing tool still in error?

nocken · 04-06-16, 12:57 PM

THE MAGNETIC DIFFERENCE IN JUNE 1940 WAS 10 DEGRESS WEST. SO LETS SAY 350 DEGRESS IS TRUE NORTH, THEN 0 DEGRESS ON COMPASS IS ACTUALLY 10 DEGRESS. SO THE QUESTION IS. DO THE IN-GAME COMPASSES TAKE IN THE DIFFERENT MAGNETIC DIFFERENCE. OR DO WE HAVE TO COMPANSATE THAT 10-11 DEGRESS DIFFERENCE.?

Pisces · 04-06-16, 01:32 PM

The magnetic anomaly is of little importance in this game/simulation. The boats in those times made use of gyro-compasses which aligned themselves to the poles of earth rotation by precession. Mere mechanical disturbances nudging it around. Not at all by magnetic torque. So modelling it seems redundant. Aside from that, there are many bugs that they had better had put their time on squashing them.

If you want to reduce errors when working with the 4-bearing method then I suggest you increase the time interval to than a halve hour. Or whatever makes the bearing drift 5 degrees to begin with. Unless you use the periscope for bearings the bearing-error isn't likely to be much smaller than a degree.

Von Due · 04-07-16, 04:39 AM

To Nocken: Mag north is far more confusing than a fixed number like 10* west. Have a look at a map of the deviation lines for the entire planet for a given month/year and if that doesn't confuse you then I don't know what will.

As for the inaccuracies in bearing, yeah greater time intervals as suggested by Pisces would get me a long way but unfortunately it seems that is a luxury I can't always afford. Sometimes I need to get it all solved in less than 20 minutes leaving only a few minutes between readings.

Pisces · 04-07-16, 05:34 AM

Quote:

Originally Posted by Von Due

...

As for the inaccuracies in bearing, yeah greater time intervals as suggested by Pisces would get me a long way but unfortunately it seems that is a luxury I can't always afford. Sometimes I need to get it all solved in less than 20 minutes leaving only a few minutes between readings.

Why do you think all will be over in 20 minutes? Your hydrophone can listen to a radius of more than 30km. It takes a contact much more time to cross that. You'll have plenty of time before you really lose it. The lines on the map may fade out before that. But the equipment can still give bearings.

Von Due · 04-07-16, 06:10 AM

Quote:

Originally Posted by Pisces

Why do you think all will be over in 20 minutes? Your hydrophone can listen to a radius of more than 30km. It takes a contact much more time to cross that. You'll have plenty of time before you really lose it. The lines on the map may fade out before that. But the equipment can still give bearings.

Last patrol I played my sound guy first picked up the contact at great range, then lost contact (!!!) even though I could clearly hear it in the hydrophone room, until the target was between 12 and 15 km out moving at medium speed (ended up passing about 700m in front of me) leaving me very little time to do the reading. Weather was real bad and I was at 40m, then 20m then periscope depth, trying to get the sound guy to work for the team.

Pisces · 04-07-16, 02:05 PM

Well, you don't need to hurry the procedure just because it is near. You are not forced to attack then. That is when mistakes are made, when you let the target decide what you must do. Just continuing the procedure, letting it pass while taking the bearings, would have given you (more) accurate speed and course and mk1 eyeball confirmation on the calculated/plotted range. Then making your attack run based on that where you call the shots on your time.

04-06-16, 12:57 PM	#1
nocken Engineer Join Date: Feb 2012 Location: sheffield.uk Posts: 200 Downloads: 1763 Uploads: 0	COMPASS. MAGNETIC DIFFERENCE THE MAGNETIC DIFFERENCE IN JUNE 1940 WAS 10 DEGRESS WEST. SO LETS SAY 350 DEGRESS IS TRUE NORTH, THEN 0 DEGRESS ON COMPASS IS ACTUALLY 10 DEGRESS. SO THE QUESTION IS. DO THE IN-GAME COMPASSES TAKE IN THE DIFFERENT MAGNETIC DIFFERENCE. OR DO WE HAVE TO COMPANSATE THAT 10-11 DEGRESS DIFFERENCE.?

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04-06-16, 01:32 PM	#2
Pisces Silent Hunter Join Date: Dec 2004 Location: AN9771 Posts: 4,904 Downloads: 304 Uploads: 0	The magnetic anomaly is of little importance in this game/simulation. The boats in those times made use of gyro-compasses which aligned themselves to the poles of earth rotation by precession. Mere mechanical disturbances nudging it around. Not at all by magnetic torque. So modelling it seems redundant. Aside from that, there are many bugs that they had better had put their time on squashing them. If you want to reduce errors when working with the 4-bearing method then I suggest you increase the time interval to than a halve hour. Or whatever makes the bearing drift 5 degrees to begin with. Unless you use the periscope for bearings the bearing-error isn't likely to be much smaller than a degree.

04-07-16, 04:39 AM	#3
Von Due Sea Lord Join Date: Jul 2012 Posts: 1,690 Downloads: 30 Uploads: 0	To Nocken: Mag north is far more confusing than a fixed number like 10* west. Have a look at a map of the deviation lines for the entire planet for a given month/year and if that doesn't confuse you then I don't know what will. As for the inaccuracies in bearing, yeah greater time intervals as suggested by Pisces would get me a long way but unfortunately it seems that is a luxury I can't always afford. Sometimes I need to get it all solved in less than 20 minutes leaving only a few minutes between readings.

04-07-16, 02:05 PM	#6
Pisces Silent Hunter Join Date: Dec 2004 Location: AN9771 Posts: 4,904 Downloads: 304 Uploads: 0	Well, you don't need to hurry the procedure just because it is near. You are not forced to attack then. That is when mistakes are made, when you let the target decide what you must do. Just continuing the procedure, letting it pass while taking the bearings, would have given you (more) accurate speed and course and mk1 eyeball confirmation on the calculated/plotted range. Then making your attack run based on that where you call the shots on your time.