Quote:
Originally Posted by Difflugia
As a weird aside, you can't easily store offline maps on the SD Card. Since the phone only has about 3.5 GB free of its on-board 8 GB, maps can quickly eat that up (Michigan is about 200 MB and the whole US is ~4.5GB). This is apparently a design decision by Microsoft, because literally every other app can store its data on the SD Card. Not only that, but a tweak to the registry used to allow external storage of the maps, but Microsoft specifically disabled changing that registry entry in a subsequent software update. I managed to get the registry entry changed, but it involved installing Microsoft's development tools and registering as a developer in order to install a hacked registry editor.
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About halfway down
this page is a long post, where the poster found Microsoft's reasoning for disallowing maps-to-SD in Win Phone 8.1:
"HERE is an integral part of the Windows Phone operating system. This means that offline maps aren't just used by our apps, but system-wide. Apps like Instagram, Foursquare, Facebook, Uber etc. all use our offline maps on Windows Phone. This is a clear benefit for you all, BUT IT ALSO MEANS THAT SD CARD SUPPORT FOR MAPS HAS TO COME FROM THE OPERATING SYSTEM ITSELF.""
Yet for Windows Phone 10, it appears that maps-to-SD is once again supported, according to
this post on another site:
"In Windows 10 Mobile, go to All Settings -> System -> Offline maps. From there, you can choose your storage location for the maps, whether internal phone storage or SD Card. It's that easy."