In October 2018, I visited Vlissingen (Flushing).
These are two of the pilot boats in the Vlissingen harbour. Very busy boats, I was told 80,000 ships move into the Scheldt past here, mainly for Antwerp of course, per annum.
The yellow boat is Dutch, the red (see print edition -Ed) Belgian.
The world is split according to an agreement between the two countries 75% Belgian pilots, 25% Dutch.