150. While on a course of 066° pgc, a light bears 18° on the port bow at a distance of 12.3 miles. What course should you steer to leave the light 4 miles abeam to port?

To pass a light 4 miles abeam to port, steer a course that makes your track tangent to a 4-mile radius circle around the light. Calculate the required course by determining the angle between your current bearing to the light and the tangent course using the formula sin θ = (desired CPA) / (current distance).