Motion Calculations in Staad.Offshore

Hi,

I am trying to figure out the equations used to generate motion accelerations in Staad.Offshore.

Take for example, using the "without gravity/tilt option", in obtaining Ax, Ay, Az, what does all the individual components (i.e. ary*cos(teta-phiry)*Z) represent? Is there a diagram to illustrate the direction/signage of how these components are obtained.

I am using Staad.Offshore version 3.0.1.2. Is all the equations in the help file under section 4.2 "Transport" correct?