As the Audacious IMO 8830920 and call sign NJMR. Of the Portuguese Dom Carlos I-class survey vessels. Building as the USNS Audacious (T-AGOS-11) of the Stalwart-class Ocean Surveillance Ships allowed on 30 September 1987, laid down by the Tacoma Shipbuilding Company on 29 February 1988, launched on 28 January 1989, commissioned on 12 June 1989, reserve since 30 November 1995, decommissioned on 9 December 1996, stricken on 6 February 1997, transferred as a hydrographic survey vessel to Portugal on 9 December 1996, commissioned as the NRP Dom Carlos I (A522) on 28 February 1997 and refitted mid 1998. Displacement of 1.565 (light)-2,535 (full loaded), gross register tonnage 1.472 tons, deadweight 786 tons and as dimensions 62,10 (waterline)-68,28 x 13,10 x 4,57 metres. Her crew numbers 46 persons. .
