It's usually called the Flagship.
The flagship is typically the leader of a fleet or armada of ships in naval tradition.
The ship that carries the commander of a fleet and flies his flag is called a "flagship." This vessel serves as the command center for the fleet's operations and is typically equipped with advanced communication and navigation systems. The flagship is often the most prominent ship in the fleet, symbolizing the commander's authority.
This depends on what is meant by "largest". With a weight of 540 tones, the heaviest ship in the First Fleet was the naval vessel, Sirius. It was believed to be about 100ft long and 32 ft at the beam (its widest point).The largest of the transport ships was Alexander,weighing in at 452 tons and being 114 ft long and 31 ft at the beam.
Jonny Fleet's birth name is Jonathan Daniel Fleet.
Nathan Fleet's birth name is Nathan Christopher Fleet.
Snowy Fleet's birth name is Gordon Henry Fleet.
Mitch Fleet's birth name is Preston Mitchell Fleet II.
flagship
A flagship is the lead naval vessel of any military fleet, or seaborne task force.
fleet foot
treasure fleet
A fleet or Convoy. A Vessel Traffic Service (VTS) nightmare ;).