Xander's Aid is a phenomenal DLC sized quest mod by Neeher. There are many new interior cells, as well as an entirely new, incredibly detailed and immersive worldspace. Unfortunately, the navmesh in the mod has some major problems and prevents followers and NPCs from pathing correctly. The interior cell navmeshes have gaps in many places, so NPCs just stop walking. The DLC sized exterior worldspace understandably was mostly created with autogeneration of navmesh, but that led to many of the same problems in the exterior. Additionally, many of the exterior worldspace cells were not finalized leading to a lack of edge links and inability of NPCs to cross cell borders. Some representative pictures of the types of problems in the navmesh are included but there were on the order of hundreds of these types of errors. This mod aims to fix these problems.

Details:
All interior cells:
Have new, handmade navmesh
Have corrected all navmesh errors
Are properly finalized
Are fully navmeshed

All exterior worldspace cells (Over 400 of them) were manually reviewed with the following priorities:
All cells finalized properly, with correct edge links
All buildings have interior navmesh
Trees are not on navmesh
Corrected majority of navmesh gaps from autogeneration
All roads with preferred pathing


Installation
With a mod manager
Load after Xander's Aid

Compatibility
Check xEdit

Thanks to Neeher for the great mod
Thanks to Lively for Magnum Opus
Thanks to Euclid for inventing the triangle without which navmesh would not be possible