Mark up your charts yet keep them clean and dry!Fold your chart to the relevant section, then zip it into this waterproof bag. Or insert two charts, back to back, for flipping between coast and harbor charts. Clear, sharp plots can be made on the cover using ball point or Stabillo pens, then rubbed off with a damp cloth.Dimensions: 22-1/2" W x 17-1/2" HWaterproof holder with zipper holds both large and compact chartsPlease note: The Region 9 and 11 Chart Kits do not fit in this cover