Magdec BGL File - Revision history

BASys: Replaced Applicable-FSVersion for MSFS with MSFS2020, added MSFS2024

2024-05-25T17:27:26Z

Replaced Applicable-FSVersion for MSFS with MSFS2020, added MSFS2024

← Older revision		Revision as of 12:27, 25 May 2024
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	{{Infobox-Applicable-FSVersion		{{Infobox-Applicable-FSVersion
	\| ~~MSFS~~ = true		\| MSFS2024 = unknown
			\| MSFS2020 = true
	\| P3D5 = true		\| P3D5 = true
	\| P3D4 = true		\| P3D4 = true

Hervesors at 17:33, 12 July 2021

2021-07-12T17:33:22Z

← Older revision		Revision as of 12:33, 12 July 2021
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	\| 0x84		\| 0x84
	\| 1 - BYTE		\| 1 - BYTE
	\| Reference date day (?)		\| Unknown - Reference date day (?)
	\| 0x01		\| 0x01
	\|-		\|-
	\| 0x85		\| 0x85
	\| 1 - BYTE		\| 1 - BYTE
	\| Reference date month (?)		\| Unknown - Reference date month (?)
	\| 0x01 (FS2004) - 0x11 (FSX/P3D/MSFS)		\| 0x01 (FS2004) - 0x11 (FSX/P3D/MSFS)
	\|-		\|-
	\| 0x86		\| 0x86
	\| 2 - WORD		\| 2 - WORD
	\| Reference date year (?)		\| Unknown - Reference date year (?)
	\| 0x1993 (FS2004) - 0x2006 (FSX/P3D/MSFS)		\| 0x1993 (FS2004) - 0x2006 (FSX/P3D/MSFS)
	\|}		\|}

Hervesors at 17:32, 12 July 2021

2021-07-12T17:32:12Z

← Older revision		Revision as of 12:32, 12 July 2021
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	\| 1 - BYTE		\| 1 - BYTE
	\| Reference date month (?)		\| Reference date month (?)
	\| 0x01 (FS2004) - 0x11 (FSX/P3D)		\| 0x01 (FS2004) - 0x11 (FSX/P3D/MSFS)
	\|-		\|-
	\| 0x86		\| 0x86
	\| 2 - WORD		\| 2 - WORD
	\| Reference date year (?)		\| Reference date year (?)
	\| 0x1993 (FS2004) - 0x2006 (FSX/P3D)		\| 0x1993 (FS2004) - 0x2006 (FSX/P3D/MSFS)
	\|}		\|}

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	Magnetic declination changes with time, more or less depending on world area.		Magnetic declination changes with time, more or less depending on world area.
	<br>		<br>
	From [http://www.ngdc.noaa.gov/geomag-web/ available historical data], it appears coded values in stock simulator files date from 1988 for FS2004 and 2009-2010 for FSX, P3Dv1-4 files and MSFS (stock MSFS magdec.bgl is identical to FSX one). P3DV5.x includes a more up-to-date file (2018-2019)		From [http://www.ngdc.noaa.gov/geomag-web/ available historical data], it appears coded values in stock simulator files date from 1988 for FS2004 and 2009-2010 for FSX, P3Dv1-4 files and MSFS (stock MSFS magdec.bgl is identical to FSX one). P3DV5 includes a more up-to-date file (2018-2019)
	<br>		<br>
	Current values (2021) differ by an average of 3-4° and 1-2° for FS2004 and FSX/P3D/MSFS respectively, although larger variations can be observed in some parts of the world		Current values (2021) differ by an average of 3-4° and 1-2° for FS2004 and FSX/P3D/MSFS respectively, although larger variations can be observed in some parts of the world

Hervesors at 17:27, 12 July 2021

2021-07-12T17:27:36Z

← Older revision		Revision as of 12:27, 12 July 2021
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	== Introduction ==		== Introduction ==
	The '''Magdec.bgl''' file ~~is located in the ..\Scenery\Base\Scenery subfolder (FS2004, FSX and all P3D versions). It~~ provides the basis for magnetic variation (declination) calculation by the simulator at current aircraft position.		The '''Magdec.bgl''' file provides the basis for magnetic variation (declination) calculation by the simulator at current aircraft position.
	<br> By convention, East magnetic variation values are POSITIVE, while west values are NEGATIVE.		<br> By convention, East magnetic variation values are POSITIVE, while west values are NEGATIVE.
	<br> See this [https://en.wikipedia.org/wiki/Magnetic_declination Wikipedia article] for some basics regarding magnetic declination meaning as well as this [https://www.aero.sors.fr/documentation/UnderstandingMV.pdf Understanding magnetic variation use in the simulators] document for a more in-depth review of its use in the simulator.		<br> See this [https://en.wikipedia.org/wiki/Magnetic_declination Wikipedia article] for some basics regarding magnetic declination meaning as well as this [https://www.aero.sors.fr/documentation/UnderstandingMV.pdf Understanding magnetic variation use in the simulators] document for a more in-depth review of its use in the simulator.
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	=== File location ===		=== File location ===
	In FS2004, FSX and all P3D versions, the Magdec.bgl file is located in the ..\Scenery\Base\Scenery subfolder.		In FS2004, FSX and all P3D versions, the Magdec.bgl file is located in the (SIM DRIVE-FOLDER)\Scenery\Base\Scenery\ subfolder.
	<br>In MSFS it is located in:		<br>In MSFS it is located in:
	<br>C:\Users\LOGINNAME\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official\OneStore\fs-base\scenery\Base\scenery\ (Box/Microsoft Store)		<br>C:\Users\LOGINNAME\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official\OneStore\fs-base\scenery\Base\scenery\ subfolder (Box/Microsoft Store)
	<br>(STEAM DRIVE):\Steam\steamapps\common\MicrosoftFlightSimulator\Official\OneStore\fs-base\scenery\Base\scenery\ (Steam edition)		<br>(STEAM DRIVE):\Steam\steamapps\common\MicrosoftFlightSimulator\Official\OneStore\fs-base\scenery\Base\scenery\ subfolder (Steam edition)

	== File structure ==		== File structure ==

Hervesors at 17:24, 12 July 2021

2021-07-12T17:24:38Z

← Older revision		Revision as of 12:24, 12 July 2021
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	\| MSFS = true		\| MSFS = true
	\| P3D5 = true		\| P3D5 = true
			\| P3D4 = true
			\| P3D3 = true
	\| P3D2 = true		\| P3D2 = true
	\| P3D = true		\| P3D = true

Hervesors at 17:23, 12 July 2021

2021-07-12T17:23:43Z

← Older revision		Revision as of 12:23, 12 July 2021
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	{{Infobox-Applicable-FSVersion		{{Infobox-Applicable-FSVersion
	\| MSFS = true		\| MSFS = true
			\| P3D5 = true
	\| P3D2 = true		\| P3D2 = true
	\| P3D = true		\| P3D = true

Hervesors at 17:09, 12 July 2021

2021-07-12T17:09:28Z

← Older revision		Revision as of 12:09, 12 July 2021
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	{{Infobox-Applicable-FSVersion		{{Infobox-Applicable-FSVersion
	\| ~~MS Flight~~ = true		\| MSFS = true
	\| P3D2 = true		\| P3D2 = true
	\| P3D = true		\| P3D = true

Hervesors at 17:05, 12 July 2021

2021-07-12T17:05:46Z

← Older revision		Revision as of 12:05, 12 July 2021
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	{{Infobox-Applicable-FSVersion		{{Infobox-Applicable-FSVersion
			\| MS Flight = true
	\| P3D2 = true		\| P3D2 = true
	\| P3D = true		\| P3D = true

Hervesors: /* Reliability of simulator data */

2021-07-12T17:02:43Z

Reliability of simulator data

← Older revision		Revision as of 12:02, 12 July 2021
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	Magnetic declination changes with time, more or less depending on world area.		Magnetic declination changes with time, more or less depending on world area.
	<br>		<br>
	From [http://www.ngdc.noaa.gov/geomag-web/ available historical data], it appears coded values in stock simulator files date from 1988 for FS2004 and 2009 for FSX and ~~P3D files~~.		From [http://www.ngdc.noaa.gov/geomag-web/ available historical data], it appears coded values in stock simulator files date from 1988 for FS2004 and 2009-2010 for FSX, P3Dv1-4 files and MSFS (stock MSFS magdec.bgl is identical to FSX one). P3DV5.x includes a more up-to-date file (2018-2019)
	<br>		<br>
	Current values (~~2018~~) differ by ~~around 3°~~ and 1° for FS2004 and FSX/P3D respectively, although larger variations can be observed in some parts of the world		Current values (2021) differ by an average of 3-4° and 1-2° for FS2004 and FSX/P3D/MSFS respectively, although larger variations can be observed in some parts of the world
	<br>		<br>


	[[category:General]][[Category:File_Formats]]		[[category:General]][[Category:File_Formats]]

Hervesors: /* File end */

2021-07-12T16:54:48Z

File end

← Older revision		Revision as of 11:54, 12 July 2021
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	=== File end ===		=== File end ===

	File end differs in FS2004 and FSX/P3D but this doesn't seem to change file usage by the simulator.		File end differs in FS2004 and FSX-P3D-MSFS but this doesn't seem to change file usage by the simulator.
	<br>		<br>
	In FS2004, file is terminated by the string "End of Data " (offset 0x1FD98 - length: 12 bytes), while there is no ending string in FSX/P3D.		In FS2004, file is terminated by the string "End of Data " (offset 0x1FD98 - length: 12 bytes), while there is no ending string in FSX-P3D-MSFS.

	== Internal calculation of current magnetic variation ==		== Internal calculation of current magnetic variation ==