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cNAV vs. Nav or true heading vs. magnetic heading


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Posted

Hi,

 

in our last training flights, we discovered a bug in the NAV and cNAV logic.

 

Waypoint 1 = Bullseye; cNav selected; Bearing in HSI and VTB are same (true heading for both)

attachment.php?attachmentid=147477&stc=1&d=1472715870

 

 

Waypoint 1 = Bullseye; Nav selected; Bearing in HSI is 130° (magnetic heading) and in VTB 140° (true heading)

attachment.php?attachmentid=147478&stc=1&d=1472715905

 

 

As you can see, the bearing information in the VTB remains the same, whether I select cNav or Nav. As you can see too, the heading band in the bottom of the VTB changes to the correct mode.

 

Bug found in the current open alpha version of DCS.

Screen_160831_214620.thumb.jpg.c3dc219ba8dcf5fe61ac90003b2a223d.jpg

Screen_160831_214622.thumb.jpg.bef2883ee998e1488df140292ff5849f.jpg

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Posted

Should be 12° according to the ME and real Charts.

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Posted

Mine has been showing a declination of +6 degrees

 

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Posted

Nevada Map, Not Caucasus.

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Posted

Makes sense now

 

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Posted

I'll check.

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Posted
I asked because changing year in ME changes the value.

I didn't know, this is simulated. Nice to know, thanks! 12° was for December 2013 with 0,1° W change rate per year.

Hardware: Intel i5 4670K | Zalman NPS9900MAX | GeIL 16GB @1333MHz | Asrock Z97 Pro4 | Sapphire Radeon R9 380X Nitro | Samsung SSDs 840 series 120GB & 250 GB | Samsung HD204UI 2TB | be quiet! Pure Power 530W | Aerocool RS-9 Devil Red | Samsung SyncMaster SA350 24" + ASUS VE198S 19" | Saitek X52 | TrackIR 5 | Thrustmaster MFD Cougar | Speedlink Darksky LED | Razor Diamondback | Razor X-Mat Control | SoundBlaster Tactic 3D Rage ### Software: Windows 10 Pro 64Bit

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Posted

Cool, the annual declination change is simulated, didn't know that either.

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Posted
Cool, the annual declination change is simulated, didn't know that either.

 

Yes. DCS stores magnetic declinations in a table that is updated regularly.

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

"The three most dangerous things in the world are a programmer with a soldering iron, a hardware type with a program patch and a user with an idea."

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