Mouse Drag on One Clip to Move Another Clip

I new to Actionscript and am trying to create an animation that will demonstrate the basics of steering a sailboat.
There will be a movieclip top view of the boat hull. Another movie clip will be the boat tiller. One end of the the tiller will have a grip that the user will drag with the mouse. Dragging the grip will turn the tiller turn right or left on its axis. When the user drags the tiller to the left, the boat hull turns to the right, and vice versa.
I can get the tiller to rotate in a circle around its axis. However, I need help on making the tiller turn no more than 15 to 20 degrees left or right, and creating an event listener that will test when the tiller is turned left or right, then turn the hull the opposite direction as a sailboat would react. Any advice would be appreciated.