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.
Microsoft also created a KB article and relased a troubleshooter to disable the upgrade: Canceling your scheduled Windows 10 Upgrade. https://support2.microsoft.com/kb/3095675/en-us. If youâd prefer not to upgrade to Windows 10 at this time, you can cancel the scheduled upgrade by running this troubleshooter.ereâs how: Right click on the Get Windows 10 App or Windows icon located in right end of the taskbar. Select âCheck your upgrade statusâ Select âCancel reservationâ. Per Microsoft Windows 10 Q&A; Yes, you can cancel your reservation at any time prior to installing Windows 10.