The TRIAXYS Mini Directional Wave Buoy is an easy to deploy, rugged and economical instrument for the measurement of directional waves. The stainless steel hull has a high strength-to-weight ratio and is powdercoated for additional corrosion resistance. The buoy is relatively small (0.6 m diameter) and lightweight (60 kg) allowing for easy deployment by two people from almost any vessel. The TRIAXYS Minis standard power supply, Lithium Thionyl Chloride battery packs, allows up to 60 days of data transmission. The versatility of the Mini allows longer-term deployments of up to six months to be achieved by adding additional battery packs. The heart of the TRIAXYS Mini Wave Buoy was developed from the proven AXYS WatchMan DCP, which integrates sensor systems and provides onboard data processing, data logging, telemetry and diagnostic/set-up routines. The TRIAXYS sensor and telemetry module contains the telemetry system (e.g., VHF transmitter), data logging system, processing unit and the sensor unit, which is comprised of 3 accelerometers, 3 rate gyros and a Fluxgate compass. The processing unit samples and analyses the data and controls all the TRIAXYS Minis systems.