A speed of at least around 30 knots would be necessary for keeping up with Navy carrier strike groups. The Italian Navy's ...

They can operate in heavy seas and winds of 45 knots, but for other than heavy-weather training, the Navy limits its use to somewhat milder sea conditions (wind speed is less than 34 knots).

The Navy detailed eight engineers to the home of ... In the first, she demonstrated underwater speeds of 26 knots. The first nuclear-powered submarine, the USS Nautilus, SSN-571, went to sea.