Weathermate Weather Station


Originally developed by BJ Marine Tech, this is a unique combination of an ultrasonic weather station and a data logging unit, that can store the data localy on an SD Card, transmit it via a wireless connection or both, extending the capability of this technology for unmanned applications. 

Utrasonic solid state technology means it has no moving parts, making it more robust and accurate than a weather station based on rotating parts. The unit comprises:

  • Ultrasonic wind speed and direction sensor
  • Compass with pitch and roll sensors
  • Pressure and temperature sensors
  • Optional integral heater for extremely cold conditions
  • Local display
  • On-board data logging to SD memory card
  • Optional radio link (Zigbee or COFDM) for remote monitoring

Another major advantage of this unit is that it can be vehicle or craft mounted as it uses the GPS data to determine the difference between the wind’s and the vehicle/craft’s velocity to give true wind speed and direction.


The Weathermate Ultrasonic Weather Station can be used for any application where either an unpredicted sudden change in weather needs to be detected in real time, conditions need to be monitored and recorded, or where pitch, roll and direction need to be monitored or controlled.


  • Weather Buoys
  • Sailing Boats/Ships/Yachts
  • Power Boats
  • Hovercraft (site carefully to avoid prop wash)
  • Offshore structures (Oil/Gas platforms, historical forts, piers, etc)
  • Wind turbine control
  • Unmanned Surface Vehicles (USV’s)
  • Surface Effect Vehicles (WIG’s Ekranoplans, etc) (site carefully to avoid prop wash)


  • Portable weather stations
  • Wind turbine control
  • Mountain expeditions
  • Festival weather monitoring
  • Emergency services – particularly Fire and Rescue
  • Agriculture – static or vehicle mounted
  • Military
  • Tall buildings and structures
  • Theme parks – particularly rides that can be affected by high wind
  • Unmanned Ground Vehicles (UGV’s)
  • Airports/Airfields
  • Aerial event safety (e.g. paragliding, micro light ground control, hang gliding, RC aircraft, etc)
  • Unmanned Aerial Vehicle (UAV) deployment and safety


The Weather Sensor Head provides an industry standard NMEA 0183 output which appears in a user-friendly manner on the local display. Furthermore, it can be integrated with existing navigation systems or sent to a PC via an optional interface or radio link.

The DataLog reads the data from the Sensor Head. Processed data is then stored on a standard SD memory card at pre-set intervals.

GPS data is also available in real time in NMEA format for integration with navigation systems. The data can be retrieved at any time by sending a Download command.

The system can be controlled from the local display, via the optional radio link or direct connection to a PC.

Additional sensors can be connected to the DataLog to extend the measurement range. The DataLog can also be programmed to carry out tasks which are conditional on the data.


Data Logging and   Transmission


Serial (Radio)                          RS232   9600 baud
Digital                                       0   – 5V , off - on
Analogue                                                 0   – 5V


Serial (cable)                           RS232   4800 baud
Digital                                      0   – 5 V, off – on
Zigbee Radio Link         Licence   exempt 433MHz
Range                                 100   metres (approx)


SC Card                                   1G   (expandable)
Sample Rate                  1   min, 10 mins, 30 mins

Data stored

Date, time, GPS valid, Latitude, Longitude,Diff GPS,   Pressure, Temp, WindDir true, WindSpeed, WindDir rel, Pitch, Roll. (Data can be custom configured.)

Unit Size               L   215mm, W115mm, D 45mm


Weather Sensor Head

Wind Speed

Range                                            0   to 80 knots
Resolution                                             0.1   knot
Accuracy dry                                  2   knots RMS
Accuracy wet                                  5   knots RMS

Wind Direction

Range                                                  0°   – 360°
Resolution                                                    0.1°
Accuracy dry                                          2°   RMS
Accuracy wet                                          5°   RMS


Op Range                                      -25°C   to 55°C
Accuracy                           +/-1.5°C   @>4kts wind
Resolution                                                 0.1°C
Compass Heading                                  3°   RMS
Barometric Pressure Range        850 to 1150mbar
                                                     25   to 34 inHg
Accuracy                                           +/-   20mbar

Whole System

Voltage                                              10   to 16V
Current                                                    200mA