Garmin GPS 17HVS Technical Specifications - Page 23

4.2.14 3D Velocity Information (PGRMV) $PGRMV,,,*hh True east velocity, -514.4 to 514.4 meters/second True north velocity, -514.4 to 514.4 meters/second Up velocity, -999.9 to 999.9 meters/second 4.2.15 DGPS Beacon Information (PGRMB) Note: PGRMB is not supported at this time. $PGRMB,,,,,,K,,*hh Beacon tune frequency, 0.0, 283.5-325.0 kHz in 0.5 kHz steps Beacon bit rate, 0, 25, 50, 100, or 200 bps Beacon SNR, 0 to 31 Beacon data quality, 0 to 100 Distance to beacon reference station in kilometers Beacon receiver communication status (0 = Check Wiring, 1 = No Signal, 2 = Tuning, 3 = Receiving, 4= Scanning) DGPS fix source (R = RTCM, W = WAAS, N = Non-DGPS Fix) DGPS mode, A = Automatic, W = WAAS Only, R = RTCM Only, N = None (DGPS disabled) 4.3 Baud Rate Selection Baud rate selection can be performed by sending the appropriate configuration sentence to the GPS sensor as described in the $PGRMC Section 4.1.3 Sensor Configuration Information (PGRMC), field . 4.4 One-Pulse-Per-Second (PPS) Output The highly accurate one-pulse-per-second (PPS) output is provided for applications requiring precise timing measurements. The signal is generated after the initial position fix has been calculated and continues until power down. The rising edge of the signal is synchronized to the start of each GPS second. Regardless of the selected baud rate, the information transmitted by the GPS sensor is referenced to the pulse immediately preceding the NMEA 0183 RMC sentence. The accuracy of the one-pulse-per-second output is maintained only while the GPS sensor can compute a valid position fix. To obtain the most accurate results, the one-pulse-per-second output should be calibrated against a local time reference to compensate for cable and internal receiver delays and the local time bias. The default pulse width is 100 ms, however; it may be programmed in 20 ms increments between 20 ms and 980 ms as described in $PGRMC Section 4.1.3 Sensor Configuration Information (PGRMC), field . 4.5 Received RTCM Data Position accuracy of less than 5 meters can be achieved with the GPS 16/17 series products by using Differential GPS (DGPS) real-time pseudo-range correction data in RTCM SC-104 format, with message types 1, 2, 3, 7, and 9. These corrections can be received by the GPS 16/17 series products on COM 2. The RTCM data must be received at the same baud rate as the COM 1 port. For details on the SC-104 format, refer to RTCM Paper 134-89/SC 104-68 by the Radio Technical Commission for Maritime Services. 190-00228-21 GPS 16/17 Technical Specifications Page 19 Rev. A