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File:AquaMap Diver LBL Acoustic Positioning Equipment.jpg

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Description
English: Dive team (Envirotech Divers) with an AquaMap long-baseline (LBL) acoustic positioning system. The three baseline transponders (B) are deployed prior to a dive and serve as the reference points for navigation. Using a short (2m) anchor line and a weight, they are secured to the seafloor. If repeat surveys need to be done over a period of time to monitor changes, the preferred technique is to establish a 'monument' at each baseline station location and secure the baseline station to that monument each time to minimize positioning variability. A monument may be a block of concrete, a railroad wheel or another heavy object. It may also be a distinctive natural feature such as a boulder. The divers navigate and record position using a terminal (A) similar to a GPS receiver. The terminal receives positioning data (baseline station distance and depth measurements) either from an integrated acoustic transponder, such as in the DS-1 station shown here, or from an external transponder.
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current20:57, 17 May 2009Thumbnail for version as of 20:57, 17 May 2009780 × 900 (703 KB)Desertstar{{Information |Description={{en|1=Dive team (Envirotech Divers) with an AquaMap long-baseline (LBL) acoustic positioning system. The three baseline transponders (B) are deployed prior to a dive and serve as the reference points for navigation. Using a sh
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