Final answer:
In boating, when a risk of collision exists with another vessel, immediately altering your course to starboard is the necessary action to take to avoid the collision.
Explanation:
When you hear the fog signal of another vessel and a risk of collision exists, the action you must take is to immediately alter your course to starboard to avoid the collision.
Altering your course to starboard means turning your boat to the right side. This action is crucial in maritime situations to prevent accidents and ensure the safety of all vessels involved.
Remember, marine navigation rules dictate specific actions to be taken in such scenarios to minimize the risk of collisions at sea.
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