The dual Ranger 2 Pro DP-INS systems will be used to track ROVs during inspection, repair and maintenance (IRM) activities and provide an independent position reference for the vessel’s Marine Technologies Class 2 dynamic positioning system.
Specialized vessels such as Brandon Bordelon, conventionally rely on ultra-short baseline (USBL) acoustics and the global navigation satellite system (GNSS) as their primary sources of DP reference data. However, a vessel’s station-keeping capability can be compromised in the event that the USBL is affected by thruster aeration or noise and the GNSS signal is simultaneously interrupted. The latter is particularly common around equatorial regions and during periods of high solar radiation.
The company says the Ranger 2 Pro DP-INS system addresses this operational vulnerability. It aids vessel positioning by exploiting the long-term accuracy of the company’s Wideband 2 acoustic signal technology with high integrity, high update rate inertial measurements. The resulting navigation output has the ability to ride-through short-term acoustic disruptions and is completely independent from GNSS.
The equipment supplied to Bordelon Marine included Sonardyne’s ship-mounted inertial navigation sensor and two HPT 7000 acoustic transceivers. The HPTs have been installed on Brandon Bordelon through-hull deployment poles and are optimized for tracking and dynamic positioning in ultra-deepwater.
The Brandon Bordelon was delivered at the end of 2015 and is currently under a 60-day contract with Tidewater Subsea.