The Coastal Explorer Trial lets you use a fully functional Coastal Explorer for 10 days.
During or after the trial period you may purchase a license for unlimited use. This will unlock the Coastal Explorer you are already using; you will not need to install a new version.
The trial contains a background chart which covers the entire world, but not with very much detail. You will probably want to use the built-in chart download features to install additional charts for the areas need.
This is a large download, around 300 MB!