The Veratron NMEA2000 Gateway J1939 works as expected and connected to a Volvo Penta D1-30F engine without any problems. However, it requires a CAN bus splitter cable, which I made myself, taking longer than anticipated. Using a ready-made splitter cable would definitely be faster.
The delivery arrived as a replacement for a misdirected shipment, and thanks to the fast shipping, it was still in time for the planned trip. The telephone service was very friendly and straightforward! Definitely order again.