When sailing foreign you usually sign articles for 6-9 months despite union dispatches being for a max of usually 120 days. The articles you sign before going foreign will statement about your wages.
My land family and friends have never understood why don’t get paid more despite getting stuck way past my relief date/ supposedly short union hitch.
Deepsea foreign will never probably get paid more for sailing over. However, I can see it happening in the Jones Act trade eventually.