NorthernUI is a great mod but the one thing that always bugged me is the fact that it allows you to see map boundaries (which is not the case for vanilla). There are two boundaries you can see:
* Vertical transparent boundary which appears only on 50% scroll. It's here because the whole map is smaller than your screen on 50% scroll. It's removed by hardcoding the minimum scroll value to 75%.
* Horizontal black boundary which appears at any scroll level, even 400%. It's always here, even in vanilla, but it's usually obstructed by other UI elements so not usually seen. It's 'removed' by manually drawing the bottom part of the map.

Due to its nature, the mod unfortunately comes with a huge list of incompatibilities.
* Dynamic Map - modifies the map on the go and makes this mod useless. The horizontal border will still appear if you use Dynamic Map, so choose between having your new landscapes and cities marked and this mod.
* ANY map replacers - this mod works by replacing the map texture. Theoretically, special versions for colored maps CAN be made but I did not bother since I love vanilla one. If you use this alongside a map mod, you'll either have no map changes or still get a horizontal border, depending on your install order.
* Non-English localizations - since different localization have different map textures, installing this mod will overwrite and put English writing there. Not as much of a bug as it is an annoyance, but who would want to fix one issue to get another, right?
* Shivering Isles - since the SI world is much smaller, the vertical border will still appear. The only way to work around this is to hardcode the minimum scroll value to 150% instead of 75% but this will negatively impact Cyrodiil, the default world. So if you got SI installed, this mod does not fully prevent the issue.

If someone wants to make this compatible with any of the above, I'm always happy to include changes.