ARMA223TF is a part of the Amtech software suite which is used for automatic atmospheric refractive index modeling. It is a two-dimensional atmospheric refractive index model (2DARM). The model takes into account the altitude, local terrain and the atmosphere including temperature, surface pressure, water vapor, general meteorological conditions, aerosols and clouds. It then calculates the path length and the total amount of light for a given direction by considering the refraction of the light beams. It is an efficient, accurate, and user-friendly tool to analyze atmosphere related problems.