Please don't use the rail planner app to plan. It doesn't get enough updates to be reliable. And some companies just don't send their timetables (or don't send them in time).

For ferry timetables, check the ferry companies’ websites.

The ferries you mention only give a discount, so you should not add them to your pass anyway.

Thanks for your answer ! I better understand :)

How is it possible to have the discount with the ferry companies when we have an Interrail pass ?

In the app under More-Benefits you will be able to select the region you want and it will show you details of any offers including ferry discounts and how to redeem them.

IF at all possible try to use the daytime ferry Turk-Sto, there are 2: Viking/red and Silja/Tallink-blue/white. Magnificent sites as they go via the archipelago-and very cheap. It was pretty common to simply show pass and buy ticket right before boarding, but in Scandinavia about all this has been transplanted to the www. Even buying normal local bustickets if you need them. SO: check the 2 ferry- sites, NOT the various other general booking sites that dr google will show you also

Hi @Benjamin Vandame 

This route was taken out from the planner since many customers have got confused and added it to “MyTrip” thinking this is included in the Pass. They would board the ship and pay for a full fare ticket. 

Have a nice day!