朝鮮人民軍海軍
On 7 August 1998, scientific personnel began to arrive at the Musudan-ri test site to prepare for a satellite launch. Two weeks later, Korean People's Navy vessels were deployed into the Sea of Japan (East Sea of Korea) to track the rocket during its ascent to orbit. The launch was originally scheduled for an evening launch window on 30 August, in order to provide favorable conditions for observing the launch. Due to adverse weather, the window was extended, and launch occurred at 03:07 GMT (12:07 local time), by which time the weather had improved.