I think they might be just simple lists of ships, captains, and places of origin (of the ship). I assume it would only deal with sailings going to or from Swedish ports, which may be part of why only this comes up (also the search function seems to be based on OCR which often doesn't work very well with the style of text used.
GRAVSUND (Gravesend?)
30 Juni (June), Juno (captain Antonissen), from Landskrona, 1 July, Luger (?) (c. Olson) from Soderhamn, Mabel, (c. Dawkins), from ditto
....
den 2 (on the 2nd July), ... Lady of Mugdrum, c. Wishart, from Landskrona
Google Books has something called Befallningshafvandes femårsberättelser which makes reference to the "Lady of Magdrum" (has him as "Writtel")