Depending on where the compass is located on the surface of the Earth the angle between true north and magnetic north, called magnetic declination can vary widely with geographic location. The local magnetic declination is given on most maps, to allow the map to be oriented with a compass parallel to true north.
2] KB2939087 recommends in case you are unable to install the Windows 8.1 Update package KB2919355 via Windows Update, then you should download and install the package manually. 3] If you receive Error 0x80071a91 when installing KB2919355 on Windows 8.1, Microsoft has released a patch to fix this issue.t should therefore first be installed on your system before your attempt to install Windows 8.1 Update or KB2919355. Go get it here if your computer does not have it. 1] If your Windows 8.1 Update has failed to installed, you need to clean up the corrupted installation.
If you see error 0xC004F061 when you try to activate Windows 10: Youâre using a product key to upgrade to Windows 10, but a previous version of Windows wasnât installed on your PC. To update, you need to have Windows 8 or Windows 7 already on your PC.rror 0xC004C008 â One copy of Windows might have been installed on multiple PCs. If you have one copy of Windows and installed it on more than one PC, activation might not work because the product key has already been used on another PC, or itâs being used on more PCs than the Microsoft Software License Terms allow.