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190-00228-08 GPS 16x Technical Specifications Rev. B
Page 5
1.5.4 GPS Performance
1.5.4.1 Receiver
WAAS Enabled
®
GPS receiver continuously tracks and uses multiple satellites to compute and update your position.
1.5.4.2 Acquisition Times
• Reacquisition: Less than 2 seconds
• Hot: Approx. 1 second (all data known)
• Warm: Approx. 38 seconds (initial position, time, and almanac known; ephemeris unknown)
• Cold: Approx. 45 seconds
1.5.4.3 Sentence Rate
1 second default; NMEA 0183 output interval configurable from 1 to 900 seconds in 1-second increments
1.5.4.4 Accuracy
• GPS Standard Positioning Service (SPS)
Position: <15 meters, 95% typical (100 meters with Selective Availability on)
Velocity: 0.1 knot RMS steady state
• DGPS (USCG/RTCM)
Position: 3–5 meters, 95% typical
Velocity: 0.1 knot RMS steady state
• DGPS (WAAS)
Position: <3 meters, 95% typical
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 (only limited at altitude greater than 60,000 feet), 3g dynamics
1.5.5 Interfaces
• True RS-232 output, asynchronous serial input compatible with RS-232 or TTL voltage levels, RS-232
polarity.
• User selectable baud rate: 4800, 9600, 19200, or 38400.
1.5.5.1 Port 1
• Configurable between NMEA 0183 Versions 2.00 (factory default) and 3.00
• ASCII output sentences GPALM, GPGGA, GPGLL, GPGSA, GPGSV, GPRMC, GPVTG (NMEA-
approved sentences); PGRMB, PGRME, PGRMF, PGRMM, PGRMT, and PGRMV (Garmin proprietary
sentences)
•
NMEA 0183 Outputs (see section 4.2 Transmitted NMEA 0183 Sentences for full protocol specifications)
o Position, velocity, and time
o Receiver and satellite status
o Differential Reference Station ID and RTCM Data age
o Geometry and error estimates
•
NMEA 0183 Inputs (see section 4.1 Received NMEA 0183 Sentences for full protocol specifications)
o Initial position, date, and time (not required)
o Earth datum and differential mode configuration command, PPS Enable, GPS satellite almanac
• Configurable for binary data output
1.5.5.2 Port 2
Real-time Differential Correction input (RTCM SC-104 message types 1, 2, 3, 7, and 9)