Mini-Ranger 2 is a sixth-generation (6G) Ultra-Short BaseLine (USBL) underwater positioning system. It offers a standard operating range of 995 metres (extendable up to 4,000 metres with Extended Range pack) and the ability to simultaneously track up to 10 subsea targets (e.g. divers, ROVs and structures) at very fast update rates.

These features mean that Mini-Ranger 2 is ideal for nearshore operations on small, quiet vessels, vessels of opportunity, pipelay and construction barges that need survey grade positioning performance without the cost and complexity of a deep water USBL solution.

Mini-Ranger 2 calculates the position of an underwater target by measuring the range (distance) and bearing (heading) from a vessel-mounted transceiver to an acoustic transponder fitted to the target; a technique known as Ultra-Short BaseLine (USBL) positioning. One of the main advantages of the USBL technique is that no other in-water acoustic equipment has to be deployed before underwater operations can commence. Only the targets being tracked need to be equipped with a transponder.

The Sonardyne 6G and Wideband 2 technology inside Mini-Ranger 2 USBL systems offer precise acoustic ranging and hardware that is easier to set up and operate, even in the most challenging subsea operating environments. These features improve the efficiency of subsea survey operations, reduce vessel delays and generate cost savings for owners.

Mini-Ranger 2 is compact and highly portable, comprising the 1U-high (desk or rack-mounted) Ethernet Serial Hub (ESH), HPT 3000 acoustic transceiver and software which is installed on the user’s own PC or ruggedised laptop1. A wide range of Sonardyne 6G mini transponders can be used with Mini-Ranger 2 allowing the user to select the most appropriate beacon for the task in hand. These include; Wideband Sub-Mini 6+ (WSM 6+), Wideband Release Transponder 6 (WRT 6), Wideband Mini Transponder 6 (WMT 6) and the new ultra-small Nano.