Nynäshamn's Turistbyrå (Nynaeshamn Municipality, Tourist office)

Landsort AIS Live (live vessel map of the Northern Baltic Sea)

Sjöfartsverket (Swedish Maritime Administration)

Skärgårdsstiftelsen (Archipelago Foundation)

SMHI (Swedish Meteorological and Hydrological Institute)

Statens Fastighetsverk SFV (The National Property Board)

Svenska Fyrsällskapet (The Swedish Lighthouse Society)

Waxholmsbolaget AB
(Waxholmsbolaget is the orderer of the public sea traffic in Stockholm's archipelago and harbour)