When it comes to ROV positioning services, C & C Technologies does it all.
Ultra Short Baseline (USBL) and Long Baseline (LBL) are subsea positioning techniques C & C employs for ROV positioning and a variety of other applications.
USBL systems calculate the position of a subsea target by measuring the range and bearing from a vessel mounted transceiver to an acoustic transponder fitted to the target. Range data is combined with vessel attitude, heading, and GPS information to calculate a position of the target transponder.
Typical applications for USBL include ROV, AUV, and towfish tracking. USBL positioning is generally considered a less costly alternative to LBL, which offers accurate positioning over a wide area.
LBL can position multiple subsea targets with the highest attainable levels of accuracy by measuring ranges between three or more transponders deployed on the seabed or a subsea structure. These transponders or "compatts” very precisely measure relative distances to one another to effectively form an underwater navigation network. LBL offers the highest available subsea accuracy and repeatability and can be configured to support both simple and complex deepwater construction projects. Typical operations may involve positioning multiple ROVs working within close proximity.
C & C provides ROV subsea positioning services for Inspection Repair
and Maintenance (IRM) operations involving choke changes, power pod
replacements, and flying lead repairs. A variety of ROV positioning
services routinely provided by C & C’s Marine Construction Survey
Services group includes touchdown monitoring of pipelines and
umbilicals, archaeological inspections of shipwrecks, push coring
acquisition, pipeline depth-of-burial surveys, and detailed inspections
of pre-lay pipeline routes.