Abstract: The theory for a laser sensor model was presented in Part I of this four-part series, followed, in Part II, by the creation of a simulation employing MATLAB and Simulink. Part III detailed the verification of the laser sensor theory and simulation by laboratory based experimentation. This fourth and final part of the series outlines the results of extensive field trials of real laser systems in the UAE and compares these with those of the simulator. This paper then briefly looks at how to incorporate the effects of atmospheric turbulence within the simulator and finishes with a brief parametric study using the simulator.