190-00228-08
GPS 16x Technical Specifications
Rev. C
Page 5
1.5.4 GPS Performance
1.5.4.1 Receiver
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, PGRMID, PGRMM, PGRMT, and PGRMV (Garmin
proprietary sentences)
•
NMEA 0183 Outputs
4.2 Transmitted NMEA 0183 Sentences
(see
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
4.1 Received NMEA 0183 Sentences
(see
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)
