06/16/2026
Modern vessels run two main data protocols: NMEA 0183 (serial, legacy) and NMEA 2000 (CAN bus, modern). While neither protocol was originally designed for Ethernet networking, modern gateway devices now make it possible to distribute marine data across an entire vessel network far more efficiently, reducing cabling complexity while improving flexibility and scalability. This lets a single instrument feed chartplotters, navigation software, and logging systems across the whole vessel network simultaneously.
The Key takeaways:
➡️ NMEA 0183 travels over Ethernet via TCP or UDP, typically on port 10110. Use TCP for single clients, UDP for broadcasting to multiple devices.
➡️ NMEA 2000 requires a dedicated gateway device to translate CAN bus data to IP — it cannot be connected directly.
➡️ Put instruments on a dedicated subnet or VLAN, use static IPs or DHCP reservations, and never expose NMEA servers directly to the internet.
➡️ Wired Ethernet for helm and autopilot; Wi-Fi is fine for secondary displays and monitoring.
➡️ In mixed-manufacturer setups, a standalone N2K gateway (such as the Actisense W2K-2 for wireless, or PRO-NDC-1E2K for wired) is more reliable than depending on an MFD to share bus data.
Inside this guide, Josh from Actisense covers:
✅ Why traditional serial connections create limitations on board
✅ How NMEA 0183 and NMEA 2000 can be bridged onto Ethernet
✅ The role of TCP, UDP, and dedicated NMEA gateways
✅ Best practices for secure and reliable vessel network design
✅ When to use wired Ethernet vs Wi-Fi
Here is your guide to modern marine network integration ⤵️ https://actisense.com/news/how-to-share-nmea-0183-and-nmea-2000-data-over-ethernet/
Actisense (Active Research Ltd) is distributed by Western Marine & Transat Marine in Canada. Visit www.westernmarine.com to find an ACTISENSE retailer near you.