The problem with paper charts is that once you have the chart, the data you rely on never changes until you purchase a new chart. Electronic charts off the ability to update and add to the data available, but actually doing the update still requires buying a new chart, though usually at a reduced price. Because of that, people rarely update their electronic charts. Navionics+ solves that problem by including unlimited updates to the basic chart data contained on your chart. The card comes pre-loaded with highly detailed charts for all Latin America, and is ready to use as soon as you plug it into your plotter. In addition, you can plug the card into your computer (using the supplied card reader) and dowload a wealth of additional information as often as you like.