Is this meant to be a comic?
The first line is easy for an English speaker, I only had to look up herkennen in my Dutch dictionary.
Hoe kan je een Hollands schip herkennen op de oceaan?
Er vliegen geen meeuwen achter.
As far as I understand it:
How can you recognise/notice(herkennen?) a Dutch ship on the ocean?
There(er) flies(vliegen) no(geen) gulls(meeuwen) behind(achter)
The second line I needed a dictionary for.
So,
How can you recognise a Dutch ship on the ocean?
There are no gulls flying behind it.
What??
Is this dutch humour? I don't get it, do Dutch sailors eat seagulls or something?
:-?