code: function(course) {
  
        // 0° = N
        // 90° = E
        // 180° = S
        // 270° = W
  
        var s = this['SCALE'];
        var k = DIRECTIONS.length;
  
        // floor((2ck + s) / (2s)) = round((c / s) * k)
        var dir = Math.round(course / s * k);
  
        return DIRECTIONS[mod(dir, k)];
      }
docs: Calculates the compass direction of the given angle
  
  @param {number} course
  @returns {string}