You pilot your vehicle to move. Decide how many actions you intend to spend before you begin Driving. The effects depend on the number of actions you spend. You can't Drive through spaces occupied by creatures, even if they are allies.
[one-action] Attempt a Piloting check. On a success, the vehicle moves up to its Speed and can turn normally. On a failure, the vehicle moves its Speed in a straight line. On a critical failure, the vehicle moves its Speed in a straight line and becomes uncontrolled.
[two-actions] (reckless) The vehicle moves up to twice its Speed in a straight line at the vehicle's current heading.
[three-actions] (reckless) You take a –5 penalty on your Piloting check to maintain control of the vehicle. The vehicle moves up to three times its Speed in a straight line at the vehicle's current heading.

You plan a short journey. While this is most often used when traveling with a mech, vehicle, or starship, the same skill can be used to determine the optimal route to take while traveling on foot. This lets you plan a general heading on a planetoid or guide your starship on an in-system voyage. If you're navigating a short journey, you typically attempt a Piloting check only once per day, but some environments or changes might necessitate rolling more often. The GM determines the DC and how long this activity takes (usually just a minute or so). More unusual locales or those you're unfamiliar with might require you to have a minimum proficiency rank to Navigate.

You prepare for a longer journey into the stars, likely making use of your starship's Drift Engine (or similar FTL device). Attempt a Piloting check to determine if you can chart a suitable path to your ultimate destination. The GM determines how long this activity takes and the DC (GM Core).

You try to run over creatures or ram another vehicle with your vehicle. If you maintain control of your vehicle, it moves up to twice its Speed in a straight line at the vehicle's current heading. You attempt to run over any creatures in your path two sizes smaller than the vehicle or smaller, and you can attempt to ram one target creature or object in your path one size smaller than the vehicle or larger.
Each creature in your path, including a rammed target, takes the vehicle's collision damage (basic Reflex save at vehicle's collision DC). If the rammed target is a vehicle, its pilot can attempt a piloting check in place of this Reflex save, with the same results. If the target of your ram takes damage, you and your vehicle each take collision damage (no save) and your movement ends.

You bring the vehicle to a stop.

You perform a stunt while Driving your vehicle, temporarily improving its effective capabilities at the risk of losing control. Drive your vehicle and choose a stunt. All Piloting checks attempted as part of your Stunt receive the listed penalty, including Piloting checks made to take a reckless action. If the Drive action and Stunt are both reckless, you must attempt the Piloting check to keep control of the vehicle twice.

You take control of a vehicle. Attempt a Piloting check; on a success, you become the vehicle's pilot, or regain control of the vehicle if it was uncontrolled. Some vehicles have complicated controls that cause this action to become a multi-action activity, and most vehicles take at least 3 actions to start if they aren't activated.