(Sail)boats with an air draft over six meters can transit from Delfzijl to Flushing (and vice versa)  using the the Staande Mastroute (intercoastal route). Thanks to this route ships with a standing mast (not more than thirty feet high) can navigate almost the entire country.

At a speed of 9 knots, using the Staande Mastroute, you can sail from the IJsselmeer to the Volkerak locks in only 24 hours. The Staande Mastroute consists of a concatenated network of waterways controled by different authorities.

To ensure a smooth transit Rijkswaterstaat issued an agreement to harmonize service times of bridges and locks. Summer service schedule starts April 1st and end October 31st. Outside these months different bridge- and lock timetables may apply!

Staande Mastroute 2011 - Rijkswaterstaat (pdf file)