Actisense PRO-NBF-1 Professional NMEA 0183 Buffer

The Actisense PRO-NBF-1 is a professional NMEA 0183 buffer that takes a single talker and cleanly feeds up to six listeners, each one fully isolated. If you've ever tried to hang a chartplotter, an autopilot, an AIS, and a VHF off one GPS output and watched the data go flaky, this is the box that fixes it. It buffers and amplifies the signal so every device downstream sees the voltage it expects, with no crosstalk and no drooping sentences.

Here's the problem it solves. A single NMEA 0183 talker only has so much drive current. Daisy-chain too many listeners onto it and you start dropping sentences, seeing checksum errors, or losing a display entirely. The PRO-NBF-1 sits between the source and the fleet of listeners, taking one opto-isolated input and splitting it into six ISO-Drive outputs. Each output is its own isolated, amplified copy of the data, so a short or a fault on one leg can't take down the others or the source device.

Isolation is really the heart of this thing. The input is OPTO-isolated and the outputs use Actisense's ISO-Drive technology, both Hi-Pot tested to 1000V. That means the talker and every listener are electrically separated from each other. On a commercial vessel where one GPS is feeding several ECDIS displays, that isolation is what keeps a ground loop or a wiring fault on one screen from cascading through the whole nav suite. The 316 stainless steel housing isn't just for looks either. It shrugs off a damp engine room and doubles as an RF shield, which is why you'll see these in serious commercial installs.

Wiring it up is quick. It runs on anything from 9 to 35V DC, so it's happy on a 12V or a 24V boat, drawing about 150mA at 12V with all outputs at full drive. There's continuous reverse-polarity and ESD protection built in, though it's still smart practice to put an inline fuse on the power feed. The connectors are 2-part pluggable screw terminals on a 5.08mm pitch, so you can wire the terminal blocks on the bench and plug them in at the helm. Mount it on a DIN rail with the DIN kit 1 bracket or straight to a bulkhead. The DIN rail itself isn't included.

You don't have to fuss with configuration. The outputs automatically track the input baud rate anywhere from 4800 to 115200 bps, so whether you're running standard 4800 baud GPS sentences or faster AIS data, it just follows along. It's fully NMEA 0183, RS-422 and RS-232 compatible, and the listener side handles RS-485 too. Three sets of LEDs, blue for power, green for a valid input, and orange flashing at the data rate on each output, give you honest diagnostics right at the panel. If those input LEDs stay dark, the first thing to check is that your input ground is tied to the boat's ground.

A couple of install tips from the field. Mount it near the breaker panel where you can to keep the 12V feed short and avoid voltage drop on a long run. Keep it at least 600mm from your compass, which is its rated compass safe distance. And in a damp locker, a dab of dielectric grease on the screw terminals keeps corrosion off the contacts. Just remember the housing is rated IP40, so it belongs behind the dash or inside a console, not somewhere it'll take direct spray.

This is gear built for people who care about a clean, reliable install. It's RINA type approved, tested to EN 60945 and DNVGL standards, rated for continuous duty from -25 to +70 degrees C, and backed by a 5-year guarantee. Whether you're rigging a commercial workboat or a serious cruising sailboat, the PRO-NBF-1 is the quiet, isolated backbone that keeps all your NMEA 0183 listeners fed and protected. And if you expand to NMEA 2000 down the road, it pairs naturally with the Actisense NGW-1 gateway on a hybrid install.