for the Union certificate of qualification as an able boatman: 900 days of navigation time, including at least 540 days in inland navigation;
i gcomhair teastais cháilíochta an Aontais mar bhádóir inniúil: 900 lá d’am longseoireachta, lena n-airítear 540 lá ar a laghad de loingseoireacht intíre;