The 84 meter long, 2507 dwt freighter Osa went aground on the Kiel Canal.  A tug was able to refloat the Osa later the same day.   The vessel proceeded to Kiel where it was inspected.   No reports of injuries, damage or pollution being released.   The Osa continued on its voyage from Brake to Koge a few hours later.   The cause of the accident was navigational error.