FREMANTLE company Nautronix Ltd will formally launch its SeaPC, a personal computer housed in a waterproof casing, at the Pacific 2006 International Maritime Exposition in Sydney from January 31 to February 3.The company believes the SeaPC is the most advanced and intuitive solution for both defence and commercial diving operations and presents significant advantages for undersea observation, surveying, navigation, data collection, digital photography, area searches and inspections. The computer features 3D navigation in the underwater environment and through water communications using straightforward text messaging.