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The large (up/down) dial is controlled with the thumb. The scope's camera is fixed in relation to the scope's axis, hence the up or down deflection described earlier is always in relation to the image on the video monitor. “Up deflection” of the camera (or “thumb down” on the dial) will always deflect the scope toward the top of the image displayed on the video screen and “down deflection” (or “thumb up”) will always aim the camera toward the bottom of the screen. For the teacher and student alike, it helps for the training center to conform to a single use of terms describing the desired action such as always using the terms “steer up” and “steer down” vs. “thumb down” and “thumb up.” Most find that describing which direction you want the camera to steer in relation to the video image as the most intuitive method as opposed to advising which way to turn the wheel with their thumb.