Osoba oznaczona jako Wt (małe t) nie opisana w legendzie (legendzie na stronie 40).
Oh, now I got it 
. More letter confusion. That 'W' thing is a Cyrillic Russian letter that is read as 'sh' and in this case this is Shturman (navigator).
If someone is copying a latin transcript where that 'sh' thing is replaced by W, it is completely wrong. They should say 'sh' as is common practice or guess that it clearly means navigator.
Штурман