Those Member States should also ensure that, regarding those inland waterways, the data regarding navigation time and journeys carried out are validated in the service record books of persons who hold a Union certificate of qualification, if the crew member so requests.
Ba cheart do na Ballstáit sin a áirithiú freisin, i gcás na n-uiscebhealaí intíre sin, go ndéantar bailíochtú i leabhair thaifid seirbhíse na ndaoine a bhfuil teastas cáilíochta de chuid an Aontais acu ar na sonraí maidir le hamanna seoltóireachta agus turais a dhéantar, má iarann an ball criú amhlaidh.