Each ultrasound probe has a marker at one end, usually a raised line or notch. This indicates the end of the probe transducer surface corresponding to the left hand side of the image on the screen. While you scan, keep this marker pointed towards either the patients head or right side as much as possible. Why? Two reasons: firstly by doing this consistently, your brain will learn that moving the probe in one direction on the patient will result in the image moving in a consistent way on the screen. Consistency here is the key as it will help you build up the necessary hand-eye-screen coordination much more quickly. Secondly, if you ever save an image to look at later, everyone knows that the left hand side of the image corresponds to the patients head or right side.