v_Excise submitted a new map: Marauders - Battleship-esque mini game with an elimination objective. Read more about this map...
The map isn't in your files. Is search visibility on? There's a new thing where it turns off after you save a map
Some maps have completely disappeared from my files, something odd is going on with the browser. Plus you can't use it on Halo Waypoint right now.
Gave it a play with both 4v4 and 5v5. The map functions perfectly, but you can break out of the map by altering the direction your spartan runs at the beginning. That can be fixed by just putting softkills around the boundaries of the map.