Page 155 - Green - Maritime Archaeology: A Technical Handbook. 2nd ed
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134 Maritime Archaeology: A Technical Handbook, Second Edition
Figure 4.18 HPASS transponders. Operator is removing protective cover from transponder. (Courtesy of Patrick Baker, Department of Maritime Archaeology, Western Australian Maritime Museum.)
velocity of sound in water. With the velocity of sound, together with various fixed parameters, the program then calculated the distances from the diver unit to each transponder. It also calculated the depth obtained from a pres- sure transducer located on the diver-unit probe and the temperature obtained from a temperature sensor on the diver unit. The resulting text file contained the following information for each fix: time, temperature (in
