1 1 MEAN SEA SURFACE (MSS) INTERPOLATION FLAG
2 2 OCEAN TIDE SOLUTION 1 INTERPOLATION FLAG (0 = 4 POINTS OVER"  OCEAN, 1 = LESS THAN 4 POINTS)
3 3 OCEAN TIDE SOLUTION 2 INTERPOLATION FLAG (0 = 4 POINTS OVER"  OCEAN, 1 = LESS THAN 4 POINTS)
4 4 METEOROLOGICAL DATA INTERPOLATION FLAG (0 = 4 POINTS OVER OC"  EAN, 1 = LESS THAN 4 POINTS)
