Abstract: Improved diver's apparatus is disclosed for automatically determining and displaying the depth and duration of a dive, as well as the allowable bottom time remaining for the dive to permit a safe ascent without going through decompression stages. For longer bottom times, the depth and duration of each decompression stop during ascent is automatically determined and displayed to the diver, an indication is provided when a stop is reached and the duration of the stop is timed. For repetitive dives the surface time between dives is used, in conjunction with the depth and duration of the previous dive, to determine the equivalent bottom time for beginning the succeeding dive.

Abstract: A traffic data gathering apparatus with a local memory having a control word per data gathering input provides highly flexible, remotely modifiable determination of various data gathering features associated with each individual input. Thus, the effective data gathering rate for each input is determinable on a per input basis to accommodate data from different types of equipment; and the data from selected pluralities of the inputs can be grouped, and grouping changes made, with considerable ease and flexibility. The data gathering rates are determined by scaling the scanning rate or, for greater resolution, by scaling data obtained at the scanning rate.