First Order Motion Transfer Function The first order motion transfer function represents first order wave induced motion of bodies of type 6 DOF - separated analysis (Body type 2). See also Separation of motions. The first order motion transfer function is also used for removing the first order wave induced motion from the total motion to obtain an estimate of the low-frequency motion when using the Non-linearity-pass (NLP) filter, see Estimation of Low Frequency Motion The first order motion transfer function is imported from WADAM or other supported boundary element code. Quadratic Current coefficients First Order Wave Force Transfer Function