BM 1 to BM 2:
#1) Taken on northern most bank (still in water and closest to BM 1).
#2) Taken in midchannel.
#3) Taken on southern most bank (in water and closest to BM 2).
BM 3 to BM 4:
#1) Taken in water on northern bank (closest to BM 3).
#2) Taken in midchannel.
#3) Taken in water on southern bank (closest to BM 4).
BM 5 to BM 6:
#1) Taken on northern bank, in water closest to BM 5.
#2) Taken on southern bank, in water closest to BM 6.
#3) Taken in midchannel.
These two ended up in the wrong bags, therefore bag #2 reads
midchannel, but actually is southern bank closest to BM 6; and bag #3
reads southern bank, but is actually midchannel.