Minigun-surfing

From wiki.soldat.nl

Minigun-surfing is a technique to move faster in maps. While you fire the Minigun, you just have to move in the opposite direction of your aiming. Due to the very high recoil of the Minigun you'll gain extra power to move faster. It is also effective when using your jets and aiming the Minigun at an angle to the ground. Most players don't see Minigun-surfing as a noble act, but if you care more for your in-game life than honor, it just might come in handy in hot situations.

It is required to get on the roof of inf_outpost; the minigun is used mainly to keep the player in the air while the jetpack is refueling.