When you follow the link, to download the file, in the pop-up window MUST answer "save in
the disk". Remember the path - where you saved the zip file - on your hard disk, unzip the file in a folder that remember
the name - usually "unzipped" - then double klick the .EXE file and follow the instructions.
All the nautical calculations we have learned in Academies.
Tides and Currents
Electronic Chart's Viewer.