GPS Receiver Devices used with HydroMagic Surveying

Byonics GPS receivers are 5-volt, WAAS enabled, WGS84, output 4800 baud NMEA 0183 serial and employ the SiRFStarIII chipset tracking up to 20 satellites. They are compatible with the TinyTrak3Plus, TinyTrak4, and most Micro-Trak transmitters, all of which provide the 5V to power the GPS directly. They have a female DB-9 connector interface on a 6 foot cable, and the cases are weather resistant so they are fine in the rain, snow and sun, and contain a magnet to be easily mounted outside a vehicle. However, they are sensitive enough to work well even indoors.

A blue LED is inside the case that is on solid then aquiring, and flashes once synced to the satellites. DB-9 pinout is 2:GPS data out (RS-232), 3:GPS data in (not normally used), 4:+5V power input, 5:ground. Current draw is about 40mA. NMEA sentences sent each second: $GPGSA, $GPRMC, $GPGGA, $GPGSV. Accuracy is approx. 5 meters with WAAS. Acquisition times are: Cold Start: 42 sec (avg), Warm Start: 38 sec (avg), Hot Start: 1 sec (min). Sensitivity is Acquisition:-148dBm, Tracking:-159dBm.