Magdec BGL File

Hervesors — Mon, 28 Sep 2026 15:27:52 GMT

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	=== File length ===		=== File length ===
	File length is 130,468 bytes in FS2004 (offsets 0x0 to 0x1FDA3) and 130,456 bytes in FSX, P3D (all versions) and ~~MSFS~~ (offsets 0x0 to 0x1FD97)		File length is 130,468 bytes in FS2004 (offsets 0x0 to 0x1FDA3) and 130,456 bytes in FSX, P3D (all versions) and MSFS2020 (offsets 0x0 to 0x1FD97)

	=== File location ===		=== File location ===
	In FS2004, FSX and all P3D versions, the Magdec.bgl file is located in the (SIM DRIVE-FOLDER)\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 MSFS2020 it is located in:
	<br>C:\Users\LOGINNAME\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official\OneStore\fs-base\scenery\Base\scenery\ subfolder (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\ subfolder (Steam edition)		<br>(STEAM DRIVE):\Steam\steamapps\common\MicrosoftFlightSimulator\Official\OneStore\fs-base\scenery\Base\scenery\ subfolder (Steam edition)
			<br> MSFS2024 Magdec data are streamed and file is not available locally
	== File structure ==		== File structure ==

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	=== File end ===		=== File end ===

	File end differs in FS2004 and FSX-P3D-~~MSFS~~ but this doesn't seem to change file usage by the simulator.		File end differs in FS2004 and FSX-P3D-MSFS2020 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-~~MSFS~~.		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-MSFS2020.

	== Internal calculation of current magnetic variation ==		== Internal calculation of current magnetic variation ==
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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 ~~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 MSFS2020 (stock MSFS2020 magdec.bgl is identical to FSX one). P3DV5 and P3DV6 include 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 differ by an average of 4-5° and 2-3° for FS2004 and FSX/P3D/MSFS2020 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]]

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Magdec BGL File