From the Mode Panel, you are able to drag into the level a special actor called Nav System Config Override.
![](https://static.packt-cdn.com/products/9781788835657/graphics/assets/e076b9b0-72f7-4027-803a-1d200c5c974d.png)
This actor allows you to override the built-in Navigation System by using another one. Of course, you will have to develop it first, and this would need a lot of effort.
![](https://static.packt-cdn.com/products/9781788835657/graphics/assets/14df0108-48ef-4609-8f2c-0008f216d03d.png)
Reasons why you should substitute the default Navigation System (or maybe used along with another one) is mainly due to overcome limitations. What about air-units; how can they do a 3D Pathfinding? How about spiders who have a surface pathfinding?