Final answer:
The Loss of Visual Contact Procedure advises pilots on what to do when they cannot see the outside environment. They should continue flying in the direction they were headed when visual contact was lost. They should not enter a spiral dive, rely on visual references only, or wait until after exiting the fog to contact ATC.
Step-by-step explanation:
The Loss of Visual Contact Procedure is a set of guidelines for pilots when they are unable to maintain visual contact with the outside environment. The correct procedure to follow is option B: continue flying in the direction that the aircraft was headed when visual contact was lost.
Option A, entering a spiral dive, is not recommended as it can be dangerous and may worsen the situation. Option C, ignoring the aircraft's instruments and relying on visual references, is also incorrect as pilots are trained to rely on their instruments in situations like this.
Finally, option D, contacting ATC after exiting the fog, is incorrect as pilots are required to contact air traffic control (ATC) immediately when they lose visual contact.