If somebody is interested in mapping ferry routes in Croatia this Ferry reference page is very useful. Also because you can revert it to your own native language.
I use this website for the smallest ferry ‘companies’.
If a ferry route is only open in a specific period i use the opening hours key in week mode (to make the info more universal) instead of maintaining this info on a yearly base.
And if the info is available i also add ferry name and via the vessel finder website the live position of this ferry.
The mentioned website is also useful to pinpoint the exact mooring-dock in a specific harbour.