So, you understand the difference this is very important, a body which is making arbitrary motions in 3 d space can have roll pitch yaw etcetera, which can be in fact, if the if the aircraft is making a completely opposite turn, you can have a pitch of 180 degree for that matter, but it will make no sense for a ship a (()). So, therefore, what is happening is that for ship, now this comes at the the issue, having said that for ship what happens, the displacements are always small, at least the pitch and yaw, yaw first of all we do not bother, because you can always orient the hull along the y axis.