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4. USB Driver
4.1 System Requirements
IBM, Pentium compatible PC and above.
16 MB memory and above
Windows 98/Me/2000/XP;
VGA Graphic Adapter.
4.2 Installation
1. Copy the ＜GR-213U->English->USB Driver->Win98_2k_XP＞USB-V2.1.0.exe from CD to hard disk.
2. Install USB-V2.1.0.exe.
3. Plug the GR-213U USB connector into the computer, the computer will search plug and play (P&P) device
automatically, and the installation of GR-213U USB Driver is complete.
4.3 Important
Verify the COM port # to start using your own navigating software.
1. Click <Start> menu, select <Settings>, then enter <Control Panel>.
2. After entering <Control Panel>, select <System>.
3. Select <Device Manager>.
4. Find the <Connect port> and check the Virtual COM Port, which was created by the USB driver,
Please note that the Virtual COM Port number might be different from every computer. Before using
navigating software, please confirm the COM Port numbers created by your computer and provided by
your navigation software. Otherwise, the navigating software won’t receive the satellite signal, because of
the un-match COM Port setting.
“#” sign represents the COM port number that being created by USB port. Usually the value will be
COM1 in normal navigation software. So the correct COM port of the navigation software needs to
be the same as the one in PC that created by USB port, and then the navigation is able to receive
correct data.
5. Software Interface
The GR-213U interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASCⅡ
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
The GR-213U supported by SiRF Technology Inc. also outputs data in NMEA-0183 format as defined by the
National Marine Electronics Association (NMEA), Standard.
The default communication parameters for NMEA output are 4800 baud, 8 data bits, stop bit, and no parity.
Table 5-1 NMEA-0183 Output Messages
NMEA Record Description
GPGGA Global positioning system fixed data
GPGLL Geographic position- latitude/longitude
GPGSA GNSS DOP and active satellites
GPGSV GNSS satellites in view
GPRMC Recommended minimum specific GNSS data
GPVTG Course over ground and ground speed