NRP Dom Carlos I (A522)

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SMG PDL PontaDelgada NRP Almirante Gago Coutinho.JPG
NRP Dom Carlos I at dock at the Portas do Mar in 2008
United States
Name: USNS Audacious
Awarded: 30 September 1987
Builder: Tacoma Boatbuilding Company
Laid down: 29 February 1988
Launched: 28 January 1989
In service: 12 June 1989
Out of service: 9 December 1996
Struck: 6 February 1997
Fate: Transferred to Portugal
Name: NRP Dom Carlos I
Namesake: King Charles I of Portugal
Acquired: February 1997
Commissioned: 1997
In service: 1997
Status: In service as a survey ship
General characteristics
Class and type: Stalwart-class ocean surveillance ship
Displacement: 1565 tons (light) 2535 tons (full)
Length: 224 ft (68 m)
Complement: 30

NRP Dom Carlos I (A522) is the lead ship of the Portuguese Navy' Dom Carlos I-class survey vessels (ex-US Stalwart-class ocean surveillance ships) adapted in Portugal for the execution of hydrography and oceanography surveys). Before the transference to the Portuguese Navy, Dom Carlos I was USNS Audacious (T-AGOS-11) surveillance ship of the United States Navy.


USNS Audacious was a Stalwart-class modified tactical auxiliary general ocean surveillance ship of the United States Navy.

Stalwart-class ships were originally designed to collect underwater acoustical data in support of Cold War anti-submarine warfare operations in the 1980s.

ex-USNS Audacious was transferred to the Portuguese Navy in 1996 and renamed Dom Carlos I in honor to Carlos I, King of Portugal and a pioneer scientist in the oceanography field.[1] The refitting of Audacious for transfer to Portugal was completed at Detyens Shipyard on the site of the former Charleston Naval Base in North Charleston, South Carolina.

In Portugal, Almirante Gago Coutinho underwent adaptation works towards its transformation into a hydro-oceanographic ship, in the Alfeite Naval Arsenal. The first phase of the transformation was carried out in 2001 and the second phase in 2004. The Portuguese Navy has tried to fix it for almost a year but that work is very difficult because of lack of money and resources and tight budget. In its full capacity for the assignments it was tasked for; this vessel stands over 6 months in service without refueling. The only reason it needs harbouring is to get the food needed for its 32 sailors on board.

Recently it was installed a new sonar dome. With this new improvement it is expected to sonar the 5,000 meter depth or more.


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