Logbook Premium – additional functionality, which you can buy inside the application. It is daily for recording data on travel and navigating. It is easy way, just two clicks - you can set your current position, speed, course and distance. You can set up your daily cruises or passages. Thanks this you can really know how much fuel you get onboard, how many Nautical Miles You have traveled and where you really are! Comfortable and irreplaceable during bad weather. Paper and pen can be put away.