unit 1 was traveling towards conway on the waccamaw river closest to the northern bank. unit 2 was traveling away from conway on the waccamaw river closest to the northeren bank. unit 1 corrected towards the southern bank to miss unit 2. unit 2 corrected towards the northern bank to miss unit 1. Unit 2 then corrected towards the southern bank. unit 2 struck unit 1 on the starboard side. unit 2 sank.