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