We present numerical results on the vision range for light signals from a navigation complex based on scanning electronically pumped semiconductor laser (SEPSL) under conditions of coastal marine atmosphere. The results are compared with the data of shipborne experiment conducted in the Gulf of Finland near the Shepelevski lighthouse and with the data of airborne experiment carried out with a similar system. The vision range obtained for the SEPSL-based navigation system is Lth ≈ (0.5-1)Sm for day and night conditions, respectively. The comparison of the calculated and the experimental data shows insignificant discrepancy at small meteorological visual range, Sm. As Sm increases the discrepancy becomes essential.