TIFU by Downloading Music over International Waters

I am on a cruise right now. Today, we stopped in the Bahamas. There, I tried downloading music that I wanted to listen to. I have international call/text/data, so it was not a big deal. The cruise's WiFi does not allow you to stream music or download it, so all music must be downloaded if you want to listen to it. However, I forgot to download a playlist on my phone as we were leaving, so I tried downloading it as we were still near the Bahamas, just not on an island. It downloaded all but 8 songs as it stopped downloading (one of the songs was stuck on 34% for 5 minutes). So, I tried downloading them again because I thought we were still in the Bahamas. However, we were now in international waters. A couple of minutes later, I get a message from AT&T that I reached $50 (USD) on cruise data after downloading some songs since we were no longer in the Bahamas. I begin to panic, but then thought that there is no way only a couple of songs could be that expensive, so I kept downloading the playlist thinking that it must have counted the entire playlist rather than just those couple of songs. After about 3 minutes from the first text, the playlist finishes downloading and I get a message that I now owe $100. This means those couple of songs did cost $50. So, I paid $100 for 8 songs. If I had known that, I would not have downloaded them.

TLDR: I spent $100 on cruise data because I thought we were still close enough to land for it to count, but we were in international waters so it cost a lot more.