I know that this is not probably the maps that you want, but, in my opinion, these maps are important.
these are the locations of alllied anti-submarine nets and minefields:
1) First mine camps made by british forces (ready from september 1915)
2) Great barrage of Dover Strait (ready from the end of 1915)
3) mine camps in north sea at the beginning of 1918
4) the Great Northen Barrage made by british and US forces at the end of 1917
5) mined camps in the eastern mediterranean made at the end of 1917 by british and hellenic forces
sorry if the images are too big.