see e.g. Who cares about the Baltic jammer ? https://media.ccc.de/v/39c3-who-cares-about-the-baltic-jammer-terrestrial-navigation-in-the-baltic-sea-region#t=165

see e.g. Who cares about the Baltic jammer ? https://media.ccc.de/v/39c3-who-cares-about-the-baltic-jammer-terrestrial-navigation-in-the-baltic-sea-region#t=1658 https://media.ccc.de/v/39c3-who-cares-about-the-baltic-jamme...