Seiko DH33 Manual - Page 12

English HOW TO USE DIVE COMPUTER FUNCTIONS When more than 30 dives are made: ● If a new dive is made when log data of 30 dives are stored in memory, the log data for the oldest dive is erased from memory and the data for the new one is recorded in memory. ● In that case, log No. for the existing data will be reduced by one. Dive that is not recorded in the dive log function Even if the dive function is started by measuring a depth greater than 1.5 m (5 ft), a dive that lasts less than 3 minutes will not be recorded. ● How to erase the log data in memory The entire log data stored in memory can be erased as required. Press to show DIVE LOG display. ▼ Press to show LOG DATA ERASURE display. • Flashing "LoGCLE" appears. ▼ 22 ▼ and Press and hold at the same time. • Flashing quickly. • Remains displayed. * "LoG-CLE" flashes quickly and then stops flashing after a few seconds, indicating that the entire log data has been erased from memory. ▼ Press to return to DIVE LOG display. • No log data is stored in memory. English USE OF TERMS IN THIS MANUAL DEFINITION OF THE TERMS AND BASIC DESIGN OF THE WATCH Terms Depth Definition and basic design of the watch The watch measures the depth of water from 1.5 m (5 ft) up to 99.9 m (328 ft) in 0.1 m (1 ft) increments. The measurement is made on the basis of seawater having a specific gravity of 1.03. Ex.) If the displayed depth of the water is 19.4 m (64 ft) in fresh water (specific gravity 1.00), the actual depth is: 19.4 m (64 ft) x 1.03/1.00 = 20.0 m (66 ft) No-decompression limits and residual nitrogen the watch provides are calculated on the basis of water pressure only, and can be used while diving in fresh water without any conversion. Dive time (DIVE. T) The watch measures and indicates dive time in one minute increments up to 599 minutes. It starts measuring the time when the diver descends more than 1.5 m (5 ft), and stops when the diver ascends to a depth of less than 1.5 m (5 ft). Water temperature The watch measures the water temperature in 0.1° C (1° F) increments from -5.0° C up to +40.0° C (23° F up to 104° F). The water temperature recorded in the dive log function is a measurement taken at the maximum depth. Terms Surface interval time (SURF. T) Definition and basic design of the watch The watch measures the time spent on the surface in one minute increments up to 48 hours, starting from the time when the diver ascends to a depth of less than 1.5 m (5 ft). If the diver descends to a depth of greater than 1.5 m (5 ft) when the surface interval time is less than 10 minutes, the previous and the new dives are considered inseparable, and the dive times of both dives and the surface interval time are added together. Algorithm The watch uses an algorithm developed by Mr. Randy Bohrer, one of the most distinguished scientists in this field, which expands upon the theories of the so-called Swiss model. Decompression diving The watch is intended for use in nodecompression diving (diving which allows you to make a direct, continuous ascent to the surface). Anticipating emergencies, it provides information for decompression diving. * Decompression diving refers to diving which requires stops at specified depths during ascent, due to an impermissible amount of nitrogen having accumulated in the diver's body. 23