WetPC (TM) is a wearable computer for underwater use. Developed by the Australian Institute of Marine Science, it allows a diver to gather and enter data immediately into a computer worn as part of the diver's gear. Instead of a keyboard or mouse, the diver interacts with the computer using a multi-button device worn at chest level and requiring only one hand. The display is attached to the diver's mask. The developers invented a new, easy-to-intuit human/computer interface that lets the user provide information in the form of multiple finger position combinations that are always visible on the display.