The "12 crew and 12 passengers" would, as far as I remember, require one doctor on board. The number of passengers a cargo ship may take without dedicated medic

The "12 crew and 12 passengers" would, as far as I remember, require one doctor on board. The number of passengers a cargo ship may take without dedicated medical staff was ridiculously low and explains why it is so much harder/expensive to travel on board as a passenger than one would expect. (8 years ago it was $200/day and up)