In our case, the top portion will be hooked to the mudsled portion on the bottom. imo Also read spec machines recent posts and links from his and my posts.
Edit: add link http://www.rdinstruments.com/articles/offshore_eng_0402_rdi.pdf "In order to obtain current profiles throughout the water column in depths greater than 1000m, Shell Global Solutions (US), RD Instruments and other manufacturers developed a realtime system which includes a rigmounted ADCP ‘looking’ down through the water column, and a bottom-mounted ADCP ‘looking’ up. The rig-mounted ADCP feeds data directly to a computer aboard the rig. The bottom-mounted system collects ADCP data and transmits it to the surface in real time via an acoustic modem." end quote (or more recently fiber optic, see thunderhorse articles)
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Workhorse Long Ranger ADCP Application Notes FUGRO GEOS rises to Thunder Horse Challenge Image courtesy of Fugro GEOS
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