The ferry Rennesoy went aground near Florø, Norway.   The ferry with a crew of 10 and no passengers was heading for the Lofoten Islands from Askøy when it hit the Svarte reef.   The reason for the grounding was due to a navigational error.   The vessel emptied its ballast tanks and a tug was able to pull the Rennesoy free.   The ferry was towed to Florø for inspection.   Reports state no injuries, damage or pollution released.