Tilt left or right to access a section, and tilt up or down to scroll through the options of that section.
Avoid
Triggers an evasive action depending on your situation. (Foward roll during exploration and various flips and rolls in combat.)
Assign item/action from Inventory
A blank button that you can assign an item/action from the invenory to for immediate access. Press this button when an item/action in the inventory is highlighted to assign it to that button.
First-Person View
Look at the envionment from your character's perspective.
Camera Control/Sidestep Mode
Press lightly to center the camera behind your character. Hold it down until it clicks to enter sidestep mode.
Defend
Trigger a defensive force-field during exploration; Block frontal enemy attacks during combat.
P.D.A. Display
Display maps, information, and a fuel-cell compass.