– Thales Mobile Mapper for locating objects on the bottom of inland water bodies and for conducting direct underwater inventory.
The paper presents a description of the construction of a measurement set consisting of a handheld GPS/GIS receiver, a specialized waterproof housing with function keys, and a floating GPS antenna. The possibility of using the set directly in underwater navigation conducted by a diver at shallow depths was investigated. The results of searching for obstacles previously located using hydroacoustic methods: single-beam echo sounder (SBES) and side-scan sonar (SSS), are described. An analysis of the accuracy of underwater GPS navigation was also performed.
APPLICATION OF HAND-HELD GPS RECEIVER TO INLAND UNDERWATER MEASUREMENTS
The paper presents the innovate technique called underwater GIS. Preliminary found under water objects (during hydroacoustic measurements), can be directly investigated. Having approximate wreck coordinates the diver can navigate to the object with the use of GIS – GPS receiver (Thales Mobile Mapper). The GPS unit is placed in special waterproof housing. The satellite signals are delivered via
GPS floating antenna connected to the receiver with the 10 meters long strong cable. This simple system gives the operator possibility to dive with the GPS receiver up to 10 meters of depth. It allows the diver to navigate to the object in order to confirm localization and prepare photo and video documentation.
The diver can see his trajectory on the screen and the GPS positions can be stored in the unit. (…)
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Source: Logistyka Magazine