Both types of charts are but a bubble of a larger area of sea, but the detail and size of the bubble are very different. Electronic charts are fine for many things, but the bubble is much smaller than a chart or else there is no real detail for the larger area. For many paddle trips the detail is what matters and the ramble may be more important than the destination. Lay the chart on the table and plan a paddle. The tiny screen isn't nearly as good at the possibilities.