commiss opinion septemb address govern netherland implement council direct eec pilotag vessel deep sea pilot north sea english channel eec letter date april perman represent netherland european commun submit document opinion commiss articl direct eec order issu minist defenc introduc certif deep sea pilot regul deal test deep sea pilot text implement provis pilotag letter director gener navig examin order issu minist defenc reveal requir obtain deep sea pilot certif possess dutch nation commiss hold view deep sea pilot function confin provid technic assist captain sea vessel remain sole respons navig manoeuvr ship cf articl implement regul pilotag commiss opinion deep sea pilot involv exercis offici author mean articl eec treati requir dutch nation incompat articl treati commiss honour invit govern netherland review part order deal nation criterion obtain certif question light articl treati cite brussel septemb commiss richard burk member commiss