Route path crossing international dateline (180º) is split

After a number of tries, I finally found it ! You have to subtract 360 to all positive longitudes (the reverse might also work).

Here is your updated file

I used some vim magic to do it, first conversion from tsv to csv, then calculation :

:%s/\t/,/
:%s/,\(1[^"]\+\)/\=','.string(eval(submatch(1))-360)/

You probably can do it with any spreadsheet software, but I'm glad I've learned to do it with vim. ;-)

Side note, gpsbabel is great for converting positions, especially to gpx as track, but was not needed after all. I just exported my already shown try, and looked at the data. When I found a longitude of -247 I guessed this would work.