The calculated distance (air line) between Golub-Dobrzyń and Gdynia is approximately 100 miles respectively 160 kilometers.
By car or train, the actual journey to Gdynia is certainly longer, as only the direct route (as the crow flies) between Golub-Dobrzyń and Gdynia has been calculated here.
Air line (approximately)
160 kilometers
86 nautical miles