Includes a lot of suggestions on GMing in general, advice on Narrating Gunwave specifically, and a number of campaign and encounter ideas.
From the introduction:
Gunwave is a free tabletop RPG system for playing war with giant robots. This manual is directed at Narrators, who run the show. For more information on playing the game, see the Gunwave All-Purpose Player's Handbook. This manual assumes that you've read the Player's Handbook.