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Underway Replenishment (UNREP) - Ship Terminology

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Ship Terminology

  • Control ship. The ship that acts a guide for the UNREP and is responsible for maintaining a steady speed and course.
  • Delivery (control) ship. It is normally the control ship. It contains items to be delivered and provides lines, rigs, etc. used for delivery.
  • Approach ship. The ship that is accepting the delivery. It makes its approach alongside the delivery ship and keeps station on the control (delivery) ship.
  • Receiving ship. It is normally the approach ship. It receives lines, rigs, etc. and item to be delivered from the delivery ship.
  • Transfer station. A predestinated area aboard each ship where the UNREP rig is located and hooked up.
  • Replenishment course. A predetermined course determined by the delivery ship that will permit ships to maintain course with a minimum of stress on rigs, etc. with considerations given to the mission of the battle group and the condition of the seas.
  • Replenishment speed. The speed maintained during the actual UNREP operation; usually between 12 and 16 knots. It is determined by wind and sea conditions and is set by the delivery ship.
  • Underway Replenishment Group (URG). The group is comprised of ships to be unrepped and the delivery ships. A Officer in Tactical Command (OTC ) in charge of the group.
  • Waiting station. An area approximately 2,000 yards aft of the delivery ship where other ships wait for replenishment.
  • Lifeguard station. A ship positioned 1,000 yards astern of the delivery ship that will rescue any personnel that may fall overboard during the UNREP.
  • Standby station. A location on the approach side and 300 to 500 yards astern of the delivery ship where the receiving ship waits to begin the UNREP.