Member States shall ensure that boatmasters hold specific authorisations issued in accordance with Article 12 when:
(a)((a)) sailing on waterways that have been classified as inland waterways with a maritime character pursuant to Article 8;
(b)((b)) sailing on waterways that have been identified as stretches of inland waterways with specific risks pursuant to Article 9;
(c)((c)) sailing with the aid of radar;
(d)((d)) sailing craft using liquefied natural gas as fuel;
(e)((e)) sailing large convoys.