In defining steer, I would steer clear of complicated examples and just say: to steer is to control which direction one is going.
Everyone who owns a car has learned to point his car in the right direction using the steering wheel. It's a bad idea to let your five year-old steer; you might end up in a sandbox. But the use of steer doesn't need to be limited to wheels and handle bars. If you have a friend torn between whether or not to go to college, you can help steer her towards the right decision. The President's job is "to steer the Ship of State."