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190-00885-07 GPS 17x HVS Technical Specifications Rev. A
Page 5
1.6.3 GPS Performance
1.6.3.1 Receiver
WAAS Enabled
®
GPS receiver continuously tracks and uses multiple satellites to compute and update your position.
1.6.3.2 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
1.6.3.3 Update Rate
• 1 record per second
1.6.3.4 Accuracy
• GPS Standard Positioning Service (SPS)
Position: < 15 meters, 95% typical
Velocity: 0.1 knot RMS steady state
• WAAS/EGNOS/MSAS
Position: < 3 meters, 95% typical
Velocity: 0.1 knot RMS steady state
• Measurement Pulse Output Time: ±1 microsecond at rising edge of the pulse
• Dynamics: 999 knots velocity (only limited at altitude greater than 60,000 feet), 2g dynamics
1.6.4 Interfaces
1.6.4.1 GPS 17x HVS Electrical Characteristics
• Differential NMEA 0183 Serial, Compatible Polarity. Default setting is 4800 baud.
1.6.4.2 Garmin Interface
Refer to the Garmin Device Interface Specification found in the Garmin Device Interface SDK for information
about the Garmin Interface. At the time of this printing, this document is located on the Garmin Web site at:
www.garmin.com/support/commProtocol.html.
1.6.4.3 GPS 17x HVS Protocol
• NMEA 0183 Version 3.01 (the factory default version) is programmable by data field 7 of the PGRMC1
sentence described in
section 4.1.4 Additional Sensor Configuration Information (PGRMC1).
• Available NMEA 0183 output sentences include GPALM, GPGGA, GPGSA, GPGSV, GPRMC, GPVTG,
GPGLL, PGRME, PGRMF, PGRMM, PGRMT, PGRMV, and PGRMB (Garmin proprietary sentences).
See
section 4.2 Transmitted NMEA 0183 Sentences for format descriptions.
• Configuration and initialization is accomplished with NMEA 0183 input sentences. Allows initialization of
information such as expected position, date, time, earth datum, and differential mode. See
section 4.1
Received NMEA 0183 Sentences
for format descriptions.
• Configurable for binary data output.
1.6.4.4 Measurement Pulse Output
• 1 Hz pulse with programmable width, configurable in 20 ms increments from 20 ms to 980 ms. See
section
4.1.3 Sensor Configuration Information (PGRMC)
for details about configuring the Measurement Pulse
Output (or PPS) feature.
• 1 μs accuracy for all conditions in which the GPS 17x HVS reported a valid and accurate position fix for at
least the previous 4 seconds.