If an aircraft is flying at 18 DME on a standard CV-1 approach, what heading should it fly given the primary marshal radial is 180?

In a standard CV-1 approach, the aircraft's position is determined using Distance Measuring Equipment (DME) and the specified radial. When the primary marshal radial is 180 degrees, this means that the aircraft should establish its flight path towards the 180-degree radial.

As the aircraft is currently at 18 DME, it would need to adjust its heading to intercept this radial effectively. To achieve that, flying a heading of 030 degrees would allow the aircraft to appropriately converge onto the 180-degree radial coming out of the radial at a steeper angle.

This heading adjustment is essential as it ensures a proper interception of the radial, ensuring safety and maintaining the correct approach path. Hence, flying 030 degrees aligns the aircraft correctly with the intended approach routing for the CV-1 standard procedure.