At the end of October, I was picking up the WX coast stations listed below.
According to my observations, they operate in two networks. The issue is broadcast synchronously in English then (I think) Swedish. Greek and Serbian pirate stations appear on the same channels during breaks, but they usually interrupt the program when WX service returns.
1674
1680
1692
1710
1728
1734
1758
1770
1779
1797