By turning navigation mode on, you let Orbis provide you directions for the best route to destination you have chosen. Generally, there are three ways of navigation.
Firstly, it is "Navigate to current position". It means that while you browse the map, the position marker ends up on certain destination. This destination is what "current position" refers to.
Secondly, it is "Navigate to target points". You put in name of the place you wish to get to, the application offers you places matching your input, you choose the right one and are navigated to the place.
Thirdly, "Open route...". This is useful especially when having Internet connection disabled: you can pre-find the route, download it to your phone and load it by navigator.