TAIPEI (Taiwan News) – Following complaints by the National Audit Office, the Ministry of National Defense (MND) said Wednesday (July 31) it would improve the capabilities of its Cardinal drones for the third version.

While conducting a review of the Cardinal II unmanned aerial vehicles (UAVs), the audit office found several problems limiting their effectiveness, per CNA. The drones lacked a target positioning system, while it was impossible to use infrared and visible spectrum systems simultaneously.

The Navy spent NT$46.5 million (US$1.41 million) in 2016 to procure six Cardinal II units, containing six drones and three backup UAVs each. The aim of the drones was to improve day and night tracking, and to prevent foreign commercial drones from entering Taiwan airspace.

In a response to a letter from the National Audit Office calling for improvements, the MND said it would include the suggested systems in plans for a new version of the drone, the Cardinal III.