Catamarans have a very different motion through the water compared with monohulls, especially if the swell is diagonal to the direction of travel. Then they tend to hobby horse in 2 dimensions and people easily get crook.
I came back from some meetings in Tas on the cat once while it was running. Aircraft style seats in a huge lounge area.
The sleeves in the back of the seats were stuffed to capacity with sick bags, maybe 3 times more than I've ever seen on a plane.
Swell was very small and diagonal to direction of travel so there was a bit of hobby horsing going on. No one was crook but many were obviously uncomfortable. Was tempted to fake a chunder and get the chain reaction going but wife at the time strongly disapproved.
The weather for the trip this day across Bass Strait was as good as it gets really, so it is not surprising the service didn't last.
DL

