Naval Tactical Data System
The "Tachikaze" class was equipped with the Tartar-D system as the key weapon system, the fleet-area air defense weapon system with the Standard-1 MR missile. At the same time, this was the American first native integrated weapon system with the Naval Tactical Data System (NTDS), so this class was the first of the Maritime Self Defense Force's ships that utilised computers widely. As the NTDS, OYQ-1 Weapon Entry System (WES) was on board on the lead ship, "Tachikaze". The OYQ-1 WES was based on the technology of the NYYA-1 which was on board on the lead ship of the , and this system was the first Japanese shipboard C4I system with the architecture of NTDS. On the second ship, "Asakaze", the improved OYQ-2 Target Designation System (TDS) was on board. And the third ship, "Sawakaze", introduced the new-generation combat direction system, OYQ-4.