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tidal stream yellow how to sail navtex set jahtu īre bura range secondary port permanent structures jahtas Ar Jahtu uz Roņu salu tide table height of tide period arjahtu white red jahtu noma drift light яхта standard port Aids to navigation floating aids aid to navigation green racon jahta regate burāšanā phase characteristic safe route low water towers phase izbraucieni ar jahtu buoys sailing lighthouses starboard nautical chart tide ar jahtu dāvana beacons kapteinis high water pārsteigums tide tables