Mariner's Heading is a term used to describe the direction a vessel is travelling in. It is usually expressed in degrees, with 0° being north, 90° being east, 180° being south and 270° being west. The two crossword solutions for this term are ALEE (4 letters) and SSE (3 letters). ALEE stands for 'away from the lee' and is used to describe a vessel travelling away from the wind. SSE stands for 'south-southeast' and is used to describe a vessel travelling in a south-southeast direction.