A TEU is a twenty-foot equivalent unit, which is used for cargo ships and container ports, and ICS flag could refer to the International Code of Signals used by watercraft. Obviously granny is talking in code about her international smuggling operation
I play pretty much the same. Insane pop, no respawn, power and elec shut off in the first 2 months, 2 hour long days, common loot spawns, but I leave transmission and migration the same. I like the feeling of using a lot of weapons and ammo just to feel somewhat safe in a new area and finding more than just a can of beans and a baking tray.
Gotta live fast, drift (into a tree) hard, die young and leave a pretty Zomboid behind