Plan a route in the Gulf of Finland
Helsinki, Porvoo, Loviisa and Kotka are the big legs along the coast, with plenty of guest harbours and natural harbours between them. Saaristo shows the services and how sheltered each place is.
The water here is more open than in the Archipelago Sea, so wind direction matters. The skerries off Porkkala and the eastern gulf offer shelter when the weather picks up.