You should consider cruising in the national waters of either the USA or Europe. There you would be able to browse normally. If you can't (maybe you're a fisherman following large fish banks so you have to get far from the coast) I advice you to download whatever you can instead of using...
I have one about first century Roma. It is very good but unfortunately unavailable here. It is Thermae Romae. https://mangakakalot.com/read-br0oc158524522314