Hydrographic survey apparatus.

摘要

Hydrographic survey apparatus includes in combination an echo-sounder (26) and a telemetry unit (28) in circuit, together with a target prism arrangement (30) for location on board a remote radio controlled water craft (10). The echo-sounder (26), telemetry unit (28) and target prism arrangement (30) are housed in a module (24) removably located in said craft (10). The craft (10) is power driven and directionally manouvrable. Power means (18) to energise said circuit is mounted in the craft (10). A micro-processsor (56) and graph plotter (54) are in circuit with the tacheometer (44) and the telemetry unit (28) and tacheometer (44) are simultaneously activated by a signal from said micro-processor (56) and readings obtained and plotted.