This tip is especially useful on multiplayer, however applicable all over.
To try and make those extra-long or high jumps to places you previously thought in-accesable, all you have to do is crouch after you jump. This can give you the extra clearence to get to all kinds of new places.
For example: on midship you can jump up to the the platforms that run alongside each edge of the map, from just where you exit the base.
