This option is available only in Charter version. In mobile version you need to download the application (apk).
NightSky module provides you with the possibility to take a look at the stars above with the view you never saw before. If your mobile device has compass you will be able to use all application functionalities.
ISS (International Space Station) tracker provides possibility to track ISS in real time and also you can see flight path of the Iridium satellite over the night sky.
The main and most interesting functionality of this module is night sky overview with stars and constellations. Go out on the deck of your sailing boat at night and explore the start as never before.