The Gill MaxiMet series represents a significant evolutionary step in compact, solid-state weather stations. These ones are specifically engineered for applications where wind measurement requires intelligent onboard processing. At the core of every wind-focused MaxiMet model is a maintenance-free, 2-axis ultrasonic anemometer that completely eliminates the mechanical wear, friction thresholds, and frequent recalibration associated with traditional cup-and-vane sensors.
What sets the MaxiMet apart from entry-level sensors like the WindSonic is its integrated spatial intelligence. By embedding an internal electronic compass directly into the sensor head, the instrument continuously tracks its physical heading. This allows the station to automatically correct wind direction data in the field, compensating for mast sway or minor installation misalignment. For mobile platforms—such as utility vehicles, emergency response trailers, or marine vessels—selecting a MaxiMet variant with an integrated GPS module enables the system to cross-reference ground speed and heading. It instantly filters out the vehicle’s movement to calculate and stream precise True Wind Speed and Direction alongside standard Apparent and or Relative Wind readings.
In standard stationary deployments, an anemometer must be meticulously hand-aligned to True North during installation. The MaxiMet reimagines this workflow by embedding an internal electronic compass directly into the sensor head.
Automatic Alignment: If a mounting mast sways, shifts, or is installed slightly off-angle, the internal compass continuously tracks the instrument’s real-time heading, automatically correcting the wind direction data before it ever reaches your data logger.
The GPS Advantage (True Wind Measurement): For mobile applications—such as utility vehicles, emergency response trailers, or marine vessels—measuring wind becomes incredibly complex because the movement of the vehicle distorts the reading. By opting for a MaxiMet variant with an integrated GPS module, the station cross-references its internal compass, real-time ground speed, and heading. It instantly filters out the vehicle’s movement to output True Wind Speed and Direction alongside Apparent Wind data.
Unlike basic anemometers that only stream instantaneous wind speed and direction, the MaxiMet features an internal microprocessor that calculates complex environmental data natively. This gives technical teams access to advanced parameters without writing extensive post-processing scripts on a PLC or logger:
WMO Wind Statistics: Outputs true World Meteorological Organisation averages, wind gusts, and peak direction vectors.
Calculated Atmospheric Data: Depending on the exact MaxiMet model chosen (e.g., GMX500 or GMX600), the station uses its primary temperature, pressure, and humidity sensors to calculate and stream Dew Point, Heat Index, Air Density, and Barometric Corrected Altitude.
The GMX200 features just the wind sensor, the GMX260 is the marine equivalent, whilst others integrate a range of different sensors that suit a range of different applications. The full range can be found in the weather station section.
The MaxiMet GMX200 is an ultrasonic wind speed and direction sensor with an electronic compass. This enables the unit to provide apparent wind measurements, average speed and direction together with WMO averages and gust data is also provided. The optional GPS also provide compensated wind speed and direction readings, making the instrument ideal for wind monitoring on vehicle and vessels. The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX240 is an ultrasonic wind speed and direction sensor with an optical rain sensor and electronic compass. This enables the unit to provide apparent wind measurements, average speed and direction together with WMO averages and gust data is also provided. The optional GPS also provide compensated wind speed and direction readings. The optical rain sensor provides a good indication of rainfall levels, where low maintenance is required, or space is limited. The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX260 Marine is similar to the GMX200 with an improved environmental protection, IP68, 6-axis compass and M12 Connection. Allowing it to survive harsh weather conditions encountered by buoys and unmanned surface vessels, including short-term immersion and compensation for tilt with pitch and roll data. Wind speed and direction is measured using an ultrasonic sensor above the main housing. Outputs are available as RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX500 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity and pressure, with no moving parts. The results are high performance across each measurement over long periods of time. The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX501 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure and solar radiation, with no moving parts. The results are high performance across each measurement over long periods of time.The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX531 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure, solar radiation and rainfall utilising an external tipping bucket rain gauge (included). The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX550 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure and rainfall utilising an external tipping bucket rain gauge (not included). The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX551 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure, solar radiation and rainfall utilising and external tipping bucket rain gauge (not included). The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX552 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure and heat stress, with no moving parts. The results are high performance across each measurement over long periods of time.The data is output in serial formats - RS232, RS485. SDI12, NMEA and Modbus. This unit is ideal for construction sites, sporting events or where extreme conditions may pose a danger to those in the area.
The MaxiMet GMX560 Marine is similar to the GMX500 with an improved environmental protection, IP68, 6-axis compass and M12 Connection. Allowing it to survive harsh weather conditions encountered by buoys and unmanned surface vessels, including short-term immersion and compensation for tilt with pitch and roll data. The combined instrument is mounted inside three double louvered, naturally aspirated radiation shields, taking ambient temperature, humidity and pressure readings. Wind speed and direction is measured using an ultrasonic sensor above the main housing. Outputs are available as RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX600 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity and pressure, and precipitation, with no moving parts. The results are high performance across each measurement over long periods of time.The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The brand new MaxiMet GMX603 is a compact weather station with a double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity and pressure, and precipitation, with no moving parts. The results are high performance across each measurement over long periods of time. The data is output in serial formats - RS232, RS485. SDI12, NMEA and Modbus,
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