ZCZC SA34 NCC-HAMBURG 041920 UTC SEP 26 NAV. WARN. NO. 500 TSS TERSCHELLING-GERMAN BIGHT FOLLOWING CONTAINERVESSELS ARE AT RISK OF LOSING CONTAINERS AND TOUCHING THE SEABED DURING HEAVY SEA CONDITIONS AND HIGH WAVES FROM A NORTH TO NORTHWEST DIRECTION: AT A WAVE HEIGHT ABOVE 3.0M CONTAINERVESSELS HAVE TO TAKE APPROPRIATE MEASURES AND ALTER COURSE IF NECESSARY TO AVOID COMING TRANSVERSE TO THE WAVE DIRECTION. AT A WAVE HEIGHT ABOVE 4.0M CONTAINERVESSELS WITH A LENGTH ABOVE 200M ARE RECOMMENDED TO FOLLOW ALTERNATIVE ROUTE VIA TSS EAST FRIESLAND AND GERMAN BIGHT WESTERN APPROACH. NNNN