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Miros RangeFinder

A high frequency vertical microwave radar providing sea level, tide, non-directional wave monitoring, ride control and air gap measurements.

The Miros RangeFinder is a dry-mounted, radar-based sensor providing sea level, tide, non-directional wave monitoring, ride control and air gap measurements. The RangeFinder is plug-and-play and Cloud-integrated, allowing for easy access to real-time local sea state data anywhere, anytime and on any device. No parts are submerged in water and no calibration is required. The RangeFinder can be delivered with motion compensation for use on vessels and with Atex IEC Ex certification.

  • Miros RangeFinder
Solbråveien 20
1383 Asker


The Miros RangeFinder is the ultimate stand-alone sensor for airgap, tide, water level, draught, and wave measurements. RangeFinder is a dry, radar-based sensor, measuring with millimeter accuracy1 in all weather conditions. The sensor is available with motion compensation for use on floating assets and vessels, and it is the only GL-certified product on the market for alpha-factor-related wave monitoring. The RangeFinder is available as an IoT-based sensor meaning that it is truly plug-and-play, only needing power and an internet connection to give secure access to immediate, real-time data about the ocean state. Now also available with Atex IECEx certification.



The RangeFinder emits a microwave frequency modulated (FM) chirp signal and receives the echo from the water surface. The signal propagation delay given by the distance from the antenna to the water surface causes a beat signal in the receiver. By means of advanced signal processing, the beat frequency is converted to an accurate distance. The FM chirp is generated by a digitally synthesized frequency sweep oscillator with absolute frequency linearity and high stability. The sensor, therefore, provides accurate range measurements and high long-term stability. Up to 200 measurements per second are averaged over a user-selectable averaging time and the distance to the surface can range from 1 to 95 meters which is superior to what any competing product can offer.

NOAA’s Center for Operational Oceanographic Products and Services (CO-OPS) conducted a 3-month field study comparing radar-based water level sensors. They found that the Miros RangeFinder is the optimal choice for wave measurements.


1   +/- 1 mm against a fixed target


  • Year of latest version
  • Area of Application
    Offshore oil and gas (E&P), offshore wind farms, OSVs and OCVs, coastal maritime
  • Type of wave recorder
  • Direction wave or non-directional
  • Output parameters
    Distance (air-gap), draught, water level, wave parameters (height, period, etc.) from spectrum and timeseries, motion data (optional)
  • Power supply (internal/external with specs)
    SM-140: PoE, SM-140/Ex: 24 V DC (12-36 V DC)
  • Output interface {eg. rs232}
    SM-140: Ethernet or serial, SM-140/Ex: Ethernet or serial, RS232
  • Weight in air [kg]
  • Width [cm]
  • Length [cm]
  • Operating temperature: min. [°C]
  • Operating temperature: max. [°C]
  • Housing material
    AL EAW 5052/EN AW 6082
  • Output data format
    NMEA, JSON over HTTP/Cloud
  • Sampling rate
    Air gap (200Hz)

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