GPS-R35 User Manual
Levave
www.levave.com
Page 9 of 17
5. Software Interface
The
GPS-R35
interface protocol is based on the National Marine Electronics
Association's NMEA 0183 ASC
Ⅱ
interface specification, which is defined in NMEA 0183,
Version 2.2 and the Radio Technical Commission for Maritime Services (RTCM
Recommended Standards For Differential Navstar GPS Service, Version 2.1, RTCM Special
Committee No.104, Type 1,2,9) or
WAAS
(in
USA area
) or
EGNOS
(in
European area
)
5.1 NMEA Transmitted Messages
Output Messages
Table 1-1 lists each of the NMEA output messages specifically developed and defined
by SiRF for use within SiRF products.
Table 1-1 NMEA Output Message
Option Description
GGA Time, position and fix type data.
GLL Latitude, longitude, UTC time of position fix and status.
GSA GPS receiver operating mode, satellites used in the position solution, and DOP values
GSV The number of GPS satellites in view satellite ID numbers, elevation, azimuth, and
SNR values
RMC Time, date, position, course and speed data.
VTG Course and speed information relative to the ground.
A full description and definition of the listed NMEA messages are provided by the next
sections of this chapter.
Table 1-2 provides a summary of supported SiRF NMEA output messages by the
specific SiRF platforms.
Table 1-2 Supported NMEA
Message SiRF Software Options
GGA
Yes
GLL
Yes
GSA
Yes
GSV
Yes
RMC
Yes
VTG
Yes
