Dean

I'm having the same problems - I cannot transmit data to my GPS which works with NMEA0183 protocols. I can read everything from the GPS but like you just want one sentence - not 6.

From the NMEA manual I should be able to control the sentences with: "$<ID requesting Device><ID of GPS device>Q,<approved sence formatter>*check><cr><lf>"

I've tried many combinations but I'm getting nowhere. I probe at the GPS Rx pin and my signal gets there OK. If someone told me there is no connection between the Rx pin on the board and the actual GPS engine I might even believe them!!!!!

I can filter the GPS sentences just the same as every sample program appears to do. But I want only one sentence and nothing annoys me more than circuitry that doesn't do what I want it to do.

Sorry this is not an answer but you are not alone.

John K

Glad to hear it's not just me! Will let you know if I get anywhere - thanks.

Got it!

115,200 baud on console out (if in use), 9,600 on gps. Insert a 1 second wait() after gps.baud() then output commands in this format:

        //as required
        //x.printf("$PMTK605*31\r\n");       
        //x.printf("$PMTK104*37\r\n");
        //x.printf("$PMTK220,1000*1F\r\n");
        //x.printf("$PMTK251,9600*17\r\n");
        //x.printf("$PMTK313,1*2E\r\n");
        //x.printf("$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n");
        //x.printf("$PMTK319,1*24\r\n");
        //x.printf("$PMTK413*34\r\n");
        //x.printf("$PMTK513,1*28\r\n");

All now fully tested and working. Hope it works for you too - cheers!