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ciallaíonn "lá ar muir" aon lá féilire nach bhfuil an soitheach sa chalafort lena linn, gan spleáchas don mhéid ama i gcaitheamh an lae sin ar lena linn atá an soitheach sin i láthair i limistéar áirithe;
"day at sea" means any calendar day on which a vessel is absent from port, irrespective of the amount of time in the course of that day that that vessel is present in an area;