If you add the DMS-notations at the correct places, 5724.3180;1548.4021
becomes 57°24'31.8" N; 15°48'40.21" E
- which is placed exactly where it should be as you state in the comments.
I suggest you load the data into QGIS as a table without geometry. Then you use the field calculator with the following expressions to create new latitude and longitude fields:
substr(LAT,1,2)||'°'||substr(LAT,3,2)||'\''||substr(LAT,6,2)||'.'||substr(LAT,8)||'"N'
substr(LONG,1,2)||'°'||substr(LONG,3,2)||'\''||substr(LONG,6,2)||'.'||substr(LONG,8)||'"E'
Then save to .csv
, then reload with the new coordinates as DMS.
You could also use excel for this editing, I guess.
It is also likely, as @mkennedy pointed out, that the original coordinates were DDMM.mmmm
. In this case the expression would be:
substr(LAT,1,2)||'°'||substr(LAT,3)||'\'N'
And similarly for the East-coordinate.