Interfaces - Garmin GPS 20x Technical Specifications

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
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 www.garmin.com/oem, 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
190-00880-00
for additional information concerning access to binary data from
3.1 Transmitted NMEA 0183 Sentences
GPS 20x Technical Specifications
Page 5
for format descriptions.
Rev. A