Five North Korean ships recently rebroadcast their locations after over a year’s absence from international trackers, the NK Pro Ship Tracker showed this week.

Their reappearances, along with those of five other North Korean vessels which came back online through last month, may indicate underused vessels being called to action amid coronavirus quarantine policies affecting ports both in the DPRK and worldwide.

Three of those previously-absent vessels sailed between Dalian, China and Nampo, DPRK in mid-to-late March, coinciding with the resumption of shipping between the two ports and the delivery of humanitarian supplies to