the hydro-morphological characteristics of the inland waterway and the absence of appropriate Fairway Information Services on the inland waterway or of suitable charts;
tá saintréithe hidreamhoirfeolaíocha ag uiscebhealaigh intíre agus ní ann do Sheirbhísí cuí Faisnéise Seolbhealaí maidir leis an uiscebhealach intíre ná do chairteacha oiriúnacha;