The sensor suite consists of a STN Atlas 9600 APRA I-band navigational radar, a C-Tech CMAS 36/39 hull-mounted sonar, an Atlas Fansweep-20 multibeam echo sounder, an Atlas Hydrographic Deso single-beam echo sounder, and a Klein 2000 towed sonar. The sonars and echo sounders allow the vessels to chart waters up to deep. There are three sets of davits fitted to carry Fantome class survey boats. The ship is fitted with a helicopter deck for an AS 350B Squirrel helicopter (detached from 723 Squadron), although there are no long-term hosting facilities. She is armed with two single 12.7 mm machine guns. The ship's company consists of 10 officers and 46 sailors, plus up to 5 trainees. The Leeuwin class were the first RAN ships to use a multi-crewing concept,[citation needed] with three complemen