Wrong paddock each time!

Right so been chasing the same geese for a couple weekends now and each time we go to hit them they seem to head to the paddocks that we are not in.

We have tried pushing them off the other paddocks but if we do that they head back to the roost and don't come back.
This morning we set up in the paddocks that they were in yesterday and where they headed to last weekend and they headed where we went last weekend. Frustrating.
Is there a way of putting them off a paddock? I have heard of a sheet being put out type thing. Does this work?

Also been using a goose flag and it pulled in one mob last weekend but didn't today. Does anyone use one? How much do you use yours, when do you use it etc.

Cheers
Paddy