Logbook 3.6 is computer log software for Mac, Windows and iPad, but it is written from the perspective of a traditional logbook. It differs from a traditional logbook in its functionality, from medical information to maintenance. The software records navigational information in an easy interface. There is a basic version, and different versions for sailor and powerboaters. Download a trial version at www.2k-yachting.de. Prices start at $22.