[_83_Gen_Jeroen]

Maybe here I have some useful information about Waalhaven:

Waalhaven as it was/is located at Rotterdam:



Building layout from the twenties:
Airstrip was a big grassfield in the lower left corner of 750 meters north-south and 850 meters east-west (where the words make a cross in the lower left corner of the picture).
Number 19 in the water was a lighthouse:



Buildings layout in early 1940:



There was also a harbor for civilian float planes just north of the airfield:
Red: normal land strip
Blue: area reserved for float planes