Data sensing and processing device for scuba divers

A portable data sensor, processor, and display mounted in a waterproof case for use by a SCUBA diver using a tank of compressed air and for continuously determining during an underwater dive the allowable remaining dive time for the diver comprising

• said data sensor including at least a means for measuring the air pressure in the tank, a means for measuring the ambient hydrostatic pressure, and a means for measuring time, all of said measuring means mounted in said case and producing data sensor output signals,
• said processor including at least a first simulating means responsive to said data sensor output signals and arithmetically combining the same for predicting the dive time remaining at depth that provides for an air reserve following an ascent to the surface, and a second simulating means responsive to said data sensor output signals and for arithmetically combining the same and predicting the dive time remaining at depth that provides for a direct ascent to the surface without the need for decompression stops, said time predicted by said second simulating means being the no-decompression dive time limit,
• said processor including a selection means for determining the allowable remaining dive time which is the lesser of the two dive times predicted by the first and second simulating means, and
• means for displaying this allowable remaining dive time on said display.