The First World War took place on all of the world's oceans, from the huge battles in the North Sea between fleets of battleships to commerce raiding in the Indian Ocean, Great War at Sea covers all of these — plus some conflicts that never actually happened beyond the plans of naval staffs and game designers.
We have lots of plans for GWAS and will be filling them out more in the next weeks. Hopefully we will have some more content ready by the time Jutland ships this spring.