Commander Sarah West was a headline appointment when she became the first female commander of a frontline warship in the 500-year history of the Royal Navy.
She described taking on the role as the greatest achievement of her career, adding: "I'm looking forward to taking HMS Portland on operations with a professional and focused team."
Earlier this year she said her work commitments made it difficult to have a relationship.
She told the Daily Mirror: "Years at sea probably explains why I'm single. But every person in the military makes sacrifices."
More top news
The Kremlin has released pictures of Russian President Vladimir Putin working out at the gym with Prime Minister Dmitrty Medvedev in Sochi.
Cloudy skies for many this Bank Holiday Sunday.
The brother of British holidaymaker Steven Cook who vanished in Crete 10 years ago has his family are "sure he's alive".