Sea fret, known in Scotland as a haar, is a coastal fog. When does sea fret happen? Coastal fog usually happens most in the spring and summer months when conditions begin to warm up but the sea (which warms more slowly) stays relatively cold. The air in the pocket then starts to cool down and forms a fog.

Hi there! In the paragraph it says “If I can find my way through the mist, known in these parts as sea fret.” They have provided the answer for you! The “mist” is known as the “sea fret.” So it’s just the jargon of seamen. Hope this helps!