Abstract: Aspects of the present disclosure include an easy to use electronic no-decompression table for use in recreational dive planning in order to avoid decompression sickness. In one embodiment, the electronic no-decompression calculator is a portable handheld unit. The user is requested to enter at least one relevant piece of information about a dive and that information is used to automatically compute depth, bottom time, and surface interval time limits as well as pressure group categorizations. In one embodiment, an information tablet is provided with information relevant to planning a dive.