The calculated distance (air line) between Yŏnggwang-ŭp and Namp’o is approximately 141 miles respectively 226 kilometers.
By car or train, the actual journey to Namp’o is certainly longer, as only the direct route (as the crow flies) between Yŏnggwang-ŭp and Namp’o has been calculated here.
Air line (approximately)
226 kilometers
122 nautical miles