Dynamic positioning systems need accurate and repeatable position reference data so that a vessel can reliably hold position when critical subsea and maneouvring operations are underway. Developed to meet the requirements of class 2 and 3 rules, our acoustic systems are compatible with every make of DP and offer you the independence to continue working even if other sensing technologies become unavailable.


Ranger 2 USBL (Ultra-Short BaseLine) works with any make of DP system including GE, Kongsberg, MT, Navis, Rolls-Royce and Wärtsilä. Arrive on location, deploy an acoustic beacon onto the seabed and get to work – confident in the knowledge that the Sonardyne Wideband® 2 signal architecture inside Ranger 2 USBL will help keep you where you want to be, time after time.

A popular choice for new build offshore, research, exploration and naval vessels, Ranger 2 can also be retrofitted to older vessels as a cost-effective upgrade to acoustic reference systems from other manufacturers.

If your vessel undertakes complex station keeping activities, such as offshore construction or deep water salvage, Ranger 2 can be configured to operate in LUSBL mode (Long and Ultra-Short BaseLine) mode which utilises a seabed network of beacons (typically five) to offer enhanced levels of system integrity. With LUSBL, more acoustic ranges means more redundancy in the solution passed to the DP desk.


Developed specifically for DP drillships and floating production vessels, Marksman builds upon the performance of Ranger 2 LUSBL by adding support for dual or triple independent hardware configurations. This allows subsea operations to continue if any part of the acoustic hardware on the vessel becomes unavailable. Marksman also supports acoustic riser angle monitoring, back-up acoustic control of blow out preventers (BOP) and acoustic command, control and data recovery for instruments used to monitor riser integrity.