Few hours?! I've been chasing it for THREE DAYS REALTIME

and nothing happend

(The most dissappointing conduct of this damn 688i was when she reached the border of the triangle with inscription "Cease Tracking" on the map and then just turned 180 degrees and followed that course for another couple of hours

) Then I've just turned to single missions and to DW. But I'm gonna give it another try one of these days, so if your tactics would allow me to pass this mission I would certainly tell you

Thank you very much for reply!
Best Regards.