The 75 meter long, 1537 dwt freighter Magda D allided with the 175 meter long, 29040 dwt tanker Maersk Barry in the Neuhofer Canal at Hamburg, Germany.   The Magda D was proceeding in the canal with a pilot when it lost control and struck the port side of the Maersk Barry.  The Magda D suffered damage to its railing and hatches while the Maersk Barry hull was dented.   No injuries reported.   The Magda D was able to proceed on its voyage to Luebeck.   Reports state the probable cause of the allision was due to the strong current in the canal at the time of incident.