310. While on a course of 066°pgc, a light bears 13° on the port bow at a distance of 12.3 miles. What course should you steer to pass 4 miles abeam of the light leaving it to port?

To pass a fixed object at a specific distance, steer a course that makes a tangent to a circle centered on the object with a radius equal to the desired closest point of approach. The angle between your course and the object's bearing is calculated using the sine function: sin (A) = CPA / Range, where CPA is the closest point of approach and Range is the initial distance to the object.