Portsmouth is famous for its Naval Dock Yards and historic Ships, HMS Victory, Mary Rose and HMS Warrior.
Gunwharf Quay is usually the place to meet to join larger vessels in Portsmouth. It is within walking distance from the train station and a stones throw from the ferry to Gosport and Haslar Marina.
Portsmouth is a very busy commercial, yachting and naval port, so your vessel berth may change to a different wharf.