I didn't even mention the web in my original comment though, and that was on purpose. When you live on a yacht, you get to be out exploring the world and enjoying life. Why would you want to be cooped up in the cabin, scrolling Facebook or Twitter, or watching Netflix all day? If that's what you want, you should probably sell your yacht and get an apartment with broadband.
There are plenty of people out there who still live without broadband. People on small islands, or in 3rd world countries. They may not be wealthy, but they have happy lives. With a yacht you can go visit some of them. Spend some time eating food and enjoying different cultures. The world is a big place.
You won't be able push a git commit with those speeds. Let alone debug a SaaS app.
Plus pulling to port is one the largest expenses when living aboard. Maybe 4G on the coast can be quite affordable, but depends on the country.
This is what life was like for me when I first got the internet back in the 90s. 14.4 dialup translated to around 1.5KB/sec. And I lived at home. I didn’t get to enjoy travelling the world in a yacht.