For longitude you could search for 'N,' and extract until comma. For latitude for example, search for 'GLL,' then extract data up to the next comma. Reply Parser window: see the tips given in the previous section. Prompt string: this is not needed as a GPS continually sends data Instrument Idle or Wait Time - 500 milliseconds

Edit COM Port Settings: these suggestions should work, but consult your GPS Manual to make sure.īaud rate: 4800 Bits: 8 Parity: none Stop bits: 1 Flow control: Xon/Xoff or Hardware (you may have to try both).

Use ComDebug to enter your GPS settings, and instructions for extracting information from the string of data.

Use an RS232 serial cable to plug the GPS into one of the PC's COM ports.

It will be saved and displayed in 'real-time'. Using Windmill you can extract as much of this data, or as little, as you require. Yyyyy.yy is longitude (degrees, minutes.m - dddmm.mm) Llll.ll is latitude (degrees, minutes.m - ddmm.mm) Full details of how to do this are in the ComDebug program Help and on our Parsing page.Īnother Example of a GPS Data String $GPRMC,hhmmss,A,llll.ll,N,yyyyy.yy,W,kk.k,tt.t,ddmmyy,mm.m,W*CSĪ is the status: data valid (A) or receiver warning (V) For the longitude channel you might search for 'N,' and extract until ','. In this example, for the latitude channel, you might tell Windmill to search for 'GLL,' and extract up to the next comma. Windmill will collect this information as 2 'channels' of data, but you have to tell it how to recognise the desired information. Out of this data string you might want to record just the latitude and longitude. This might look something like thisįirst, there is a NMEA code ($GPGLL), then the latitude, North or South, Longitude, East or West, Time (hhmmss), Data Valid (A), Carriage Return and Line Feed. The GPS receiver sends data in a string or sentence. Our Windmill COMIML software runs under Windows 10, 8, 7, Vista and XP.Įxtracting Information from the GPS's String of Data | Step-by-Step | Trouble-ShootingĮxtracting Information from the GPS's String of Data

Software, like Windmill, to read the GPS data.

An RS232 cable, or a USB-serial converter, to connect the GPS to the PC's com port.

To collect live data from your GPS receiver on your laptop you need: Data Acquisition » Serial Communications » Interfacing GPS Receivers Connecting a GPS Receiver to a Laptop PC

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