Maretron Sending Units

Maretron Sending Units: Precision Data at the Source

When it comes to marine vessel monitoring, accurate data begins at the sensor — and that is exactly where Maretron has built its reputation. As a specialist in NMEA 2000 monitoring and control systems, Maretron designs its sending units to feed reliable, real-time data directly into a vessel's network backbone, giving operators a clear and trustworthy picture of what's happening throughout their boat.

What Are Marine Sending Units?

A sending unit is the foundational sensor that measures a physical condition — such as fluid pressure, fuel flow, temperature, or tank level — and transmits that data to a display or monitoring system. On a modern vessel, these readings are critical: an undetected drop in fuel pressure or an unexpected spike in fluid temperature can escalate quickly into a serious mechanical problem. Reliable sending units are therefore not a luxury; they are an essential layer of safety and situational awareness on any boat.

Why Maretron for Sending Units?

Maretron is an American company established in 2003 with a focused mission: to bring sophisticated monitoring and control technology to both commercial and recreational mariners. The company gradually expanded its product assortment and designed equipment based on the NMEA 2000 protocol to monitor engines, generators, batteries, bilge mechanisms, and signals from various gas and fire detectors.

What sets Maretron apart is its unwavering commitment to the NMEA 2000 standard. NMEA 2000 is a plug-and-play communications standard used for connecting marine sensors and display units within ships and boats, meaning a Maretron sending unit integrates seamlessly into any compliant network — no proprietary cabling workarounds required. Communication runs at 250 kilobits-per-second and allows any sensor to talk to any display unit or other device compatible with NMEA 2000 protocols, making data from Maretron sending units immediately available across the entire vessel network.

Maretron's product lineup includes dedicated monitoring modules that pair directly with sending units for a complete end-to-end solution. Key products include the FFM100 Fuel Flow Monitor, FPM100 Fluid Pressure Monitor, TMP100 Temperature Monitor, and CLM100 Current Loop Monitor, all designed to accept input from sending units and relay that data over NMEA 2000. Whether you are looking to retrofit a tank with an existing resistive sensor, or you want precision tank levels even when heeled over during sailing, Maretron has the products.

Thanks to innovative metering technology and accurate sensors, the Maretron fuel flow monitor earned the 2012 Sail Magazine Pittman Innovation Award, a testament to the engineering quality that carries through to all of Maretron's sensing products.

Today, Maretron vessel monitoring, MPower digital switching, and OctoPlex power distribution products are part of the Raymarine family, bringing additional engineering resources and broader ecosystem integration while maintaining the trusted Maretron product lines that mariners rely on.

Choosing the Right Sending Unit for Your Vessel

When selecting a sending unit, consider the specific parameter you need to monitor — fuel flow, fluid pressure, temperature, or tank level — and ensure the unit is compatible with your existing NMEA 2000 network. Maretron's sending units are engineered for accuracy and durability in the demanding marine environment, and they are designed to pair cleanly with Maretron's broader suite of display and monitoring modules for a fully integrated monitoring solution. Whether you're outfitting a new build or upgrading an existing system, Maretron sending units offer the precision and interoperability that serious mariners depend on.