JimL wrote:
there is a prohibition for flight at night with a cloud base below 1500ft (even for offshore)
This must be enroute, right? Well, even if it is enroute, it doesn´t make any sense.
There are several IFR procedures that takes you safely below 1500ft offshore at night. Enroute Descent Offshore, NDB Cloud Break Procedure and ARA, have all their respective minima well below 1500ft.