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Wrong Heading


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OK, we have had this same problem since the Beta version. It definitely is not related to the MAG Variation since flying heading 160 doesn't work while heading 161 works just fine. We have been trying to solve this for over a year now. Finally, last night as I was trying to fall asleep, I figured it out:

 

We are trying to be "smart" and as part of our sector file, we use the NDB fixes to show the MVA. It so happens that the MVA around Mt Rainer is 16000 feet. Hence we put an "NDB" in the sector file called "160". Now when we try to fly an aircraft using AcSim on a heading of 160, it thinks we mean the navaid called "160" and flies toward the "NDB".

 

Another "hack" solution is to add 2 zeros to your mva's defined in the [NDB] section (i.e change 160 to 16000). Tried this and ASRC and VRC don't complain about it.

Gerry Hattendorf

ZLA Webmaster

VATSIM Supervisor

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  • 1 month later...

Hi Chris

Any sign of light at the end of the tunnel

This is such a great training tool. We have been using your Boston Sector file to train our NZ controllers, and have put together some great exercises.

The only limiting factor i have found is the number of a/c that one pilot/driver can handle at a time.

To accurately simulate the changes in ground speed and rate of altitude change with climb and descent limits most drivers to four or five a/c.

However the sweatbox server seems quite happy with up to five individuals logged on at once participating in the same exercise.

Keep up the good work it is much appreciated.

Rgds

John Gayford

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ACSim has been used a bit in our VACC but the heading bug is messing up the exercises. I did a simple test and measured the error. The result was a sinusoid pattern with maximum errors at approximately 60,120,240 and 320 degrees. The error was 15 degrees.

Sector file details :

[iNFO]

FINLAND AIRAC 0512

EFES_CTR

EFHK

N063.43.00.000

E025.55.00.000

600

270

-5.3

10

 

 

 

errors.png

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  • 2 weeks later...

Hello Pontus

Strange error you reported, variing acording to the heading...

In my case I get a constant error of 19º at any heading, using a Sfile with the following

[iNFO]

ACADEMIA E TMA-SP - V2.3

SBYS_APP

SBYS_APP

S021.59.04.000

W047.20.39.000

60

56

19.3

1.000000

Jose Olyntho

VATBRZ - ID 816398 - INS+

atc2o_peq.png

Since 2001 Trainning Pilots and Controllers at http://www.jo.eng.br/

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Hi Jose

[iNFO]

New Zealand Ubersector v1.1

NZWN_CTR

NZWN

S041.19.40.854

E174.48.30.285

60

46

-21.7

1

 

Here in New Zealand i use the above sector file.

I find the heading error varies with Latitude.

For example aircraft radiating from the same point at the following latitudes gives the following errors.

 

At 51degrees south 33 degree error.

At 43degrees south 45 degree error.

At 41degrees south 55 degree error.

 

Does anybody know if Chris has time to work on this problem or has the real world taken over his life.

 

Rgds

John Gayford

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