190-00880-00
GPS 20x Technical Specifications
Rev. A
Page 5
1.5.3.4
Accuracy
•
GPS Standard Positioning Service (SPS)
Position:
< 15 meters, 95% typical
Velocity:
0.1 knot RMS steady state
•
WAAS
Position:
< 3 meters, 95% typical
Velocity:
0.1 knot RMS steady state
•
Dynamics: 999 knots velocity (only limited at altitude greater than 60,000 feet), 2g dynamics
1.5.4
Interfaces
1.5.4.1
GPS 20x Electrical Characteristics
USB 2.0 full-speed protocol compatible, as well as USB 1.1 full-speed protocol.
1.5.4.2
Garmin Interface and Garmin USB Protocol
Refer to the
Garmin Device Interface Specification
found in the Garmin Device Interface SDK for information
about the Garmin Interface and the Garmin USB Protocol. At the time of this printing, this document is located on
the Garmin Web site at:
www.garmin.com/support/commProtocol.html.
See
Appendix B: Garmin Binary Output Format
for additional information concerning access to binary data from
the GPS 20x.
Using Spanner (an application that can provide NMEA output via a virtual COM port), the GPS 20x can send
NMEA 0183 output sentences. Spanner is available for free on the Garmin web site. To download the software, start
at
, select the GPS 20x, and then select
Updates & Downloads
.
Available NMEA 0183 output sentences include GPGGA, GPGSA, GPGSV, GPRMC, and PGRMT (Garmin
proprietary sentence). See section
3.1 Transmitted NMEA 0183 Sentences
for format descriptions.
