[B]EB-55[/B] is the leading brand around the world. It consists of SiRF Star III technology (INTERNAL 4Mbit FLASH) have excellent performance would provide you with sufficient functions to easily engage all the targets, personal locating function and even academic research. Specifications: Acquisition at low signal levels Cold 60 sec.(typical) warm 38 sec.(typical) Hot start 8 sec.(typical) Tracking sensitivity -154dBm (at the receiver input) Re-acquisition Time 3sec. typical (within 5sec. Block out) 5sec typical (within 60sec block out) Position Accuracy Accuracy (SA off) Position <10meters , 2D RMS. Receiver Receiver type L1 frequency , C/A Code, 20-channel Max. Update rate 1HZ Operational Limit Altitude < 18,000m(60,000ft) Operational Limit Velocity < 515m/s(1,000knots) Protocol Support NMEA-0183 Activated message GLL, GGA, RMC, VTG, GSV, GSA all with checksum enabled SiRF Binary Datum SiRF Binary, AI3/F ,WGS-84(default), selectable for other Datum Operating Humidity 5% to 95%, No Condensing Dimension 19mm x 19mm(max.19.7mm) x 2.6mm Electrical Operating supply 2.7V~3.6V DC. Supply current (at 3.3V DC.) +/-80mA (TYP.) Storage temperature -55oC~+100oC Operating temperature -40oC~+85oC