Of course, if you have two or more engines, you can steer with some degree of reliability by alternate shifting. Want to make a turn starboard? Engage the port engine and leave the starboard-side gear in neutral. For a sharper turn, you can reverse the engine on the same side as the turn, but only at slow speeds. This too should be practiced before your steering fails and you have to do it. Different boats behave differently, and it pays to learn how yours will perform before the gull guano hits the bilge blower.