This is a really nice mod.

I've tweaked it for my scenarios because they use more than game.surfaces[1], but you probably want to either take those changes or implement it your way.

My tweaked version is https://mods.factorio.com/mod/jvm-cargo-ships.

Thanks!

hey, am i right to assume that only files you needed to touch where the ones in the logic folder? i am (with slight changes) adding your changes to this mod

i uploaded a version that includes your changes

i think you are correct about it being only the logic folder. Thanks so much for getting this fixed!