Calculation of the sound fields in the environment model including simultaneously atmosphere, water and bottom

This report introduces the description of the program package for calculation of the broadband transfer functions of the environment model including atmosphere, water column and bottom taking into account the dependence of the medium acoustic properties both on vertical and horizontal coordinates by the pseudodifferential parabolic equation technique in one-way approximation without taking into account shear stresses. Calculation examles are included both verifying the package functionality and having some applicable interest.