According this link, http://forum.scramble.nl/viewtopic.php?f=81&t=104830 there should be a Mi-2 helicopter on board of a vessel. Went there myself this afternoon to have a look as Wormerveer is a town next of my own town. From the Wormerveer side no registration or ID could be seen. As there was nobody on board of the vessel I did not went on board to check the ID or c/n of this helicopter. To see the other side of the helicopter I went to the town of Wormer. Also from this side no registration or ID could be seen. The picture if taken from the Wormer side. More info about the purpose of this helicopter can be found here, http://www.dichtbij.nl//zaanstreek/regi ... -zaan.aspx