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.
So there you have it, Windows 8.1 users. Install the April update or you're out of luck as far as future updates. Fortunately, that's not a terrible burden. The April update isn't difficult to install and logically should be installed prior to any future updates anyway.he majority of Windows 8.1 customers have installed the Windows 8.1 update , Microsoft spokeswoman Jill Lovato told CNET in an email on Monday.