Install xtide-data-nonfree by entering the following commands in the terminal:
sudo apt update sudo apt install xtide-data-nonfree
Description:
Harmonics data for xtide (Canada, Netherlands, Germany and UK)
XTide is a package that provides tide and current predictions in a wide variety of formats. Graphs, text listings, and calendars can be generated, or a tide clock can be provided on your desktop. . This package provides _extra_ harmonic station data for the xtide package. XTide works fine without them using the (free) xtide-data package which provides harmonics data for the US, but this package adds non-free data for Canada, the Netherlands, Germany and the UK. . This package is non-free because commercial distribution of the data is not allowed.
Homepage: http://www.flaterco.com/xtide/
Version: 20100529-1
Section: multiverse/science