Appendix C. Specifications
C-2
DGPS (USCG/RTCM)
Position:
3-5 meters, 95% typical
Velocity:
0.1 knot RMS steady state
DGPS (WAAS)
Position:
Less than 3 meters
Velocity:
0.1 knot RMS steady state
PPS Time:
±1 microsecond at rising edge of PPS pulse (subject to
Selective Availability)
Dynamics:
999 knots velocity (limited above 60,000 feet, 6g dynamics)
Interfaces
True RS232 output, asynchronous serial input compatible with RS-232 or TTL
voltage levels, RS-232 polarity. Selectable baud rates (300, 600, 1200, 2400,
4800, 9600, 19200)
Port 1
NMEA 0183 version 2.00 and 3.00
ASCII output sentences GPALM, GPGGA, GPGLL, GPGSA, GPGSV,
GPRMC, GPVTG; Garmin proprietary sentences PGRMB, PGRME, PGRMF,
PGRMM, PGRMT, PGRMV
NMEA 0183 Output:
Position, velocity and time
Receiver and satellite status
Differential Reference Station ID and RTCM Data age
Geometry and error estimates
NMEA 0183 Inputs:
Initial position, data and time (not required)
Earth datum and differential mode configuration command, PPS Eanble, GPS
satellite almanac
Configurable for binary data output including GPS carrier phase data
Port 2
Real Time Differential Correction input (RTCM SC-104 messages types 1, 3,
3, 7 and 9), no output
PPS
1 Hz pulse, programmable width, 1 microsecond accuracy
Power Control
Off: Open circuit
On: Ground or pull to low logic level < 0.3 volts
Environmental Characteristics
Temperature:
-30°C to +80°C operational, -40°C to +80°C storage
