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[commuted]

I was unable to get the windows software to work but in Linux the BU-353 continuously outputs valid NMEA strings. Is this working as it should or does it need to be polled?

[GS_TECH01]

Just a couple of questions:

What is the operating system of your Windows OS?
When you mean it's not working properly on your Windows OS, do you see scrolling data?
Is the red light blinking on the device or is it steady on?

Perhaps, when you're testing the BU-353 with Linux, the protocol was switched to SiRF mode. For more info, please refer to this forum posting: http://www.usglobalsat.com/forum/index.php?topic=3413.msg8820#msg8820

[commuted]

I'm using the Windows program that came in the box; I could not get this to work. It has not been used with any GPS software. Using the Windows 7 power shell I noticed that it sends out NMEA codes all the time. Should it send out NMEA strings all the time? It does the same thing on Linux when a USB Serial port is opened these strings are pouring out.

So my question is do I need to return this piece? I'm doing some development and it wouldn't do to get my software working with only one part.

Thanks

[GS_TECH01]

What do you mean NMEA codes? Can you please provide an example?
Also, have you tried testing the device with GPSInfo program (http://www.usglobalsat.com/store/downloads/GPSInfo.zip)? You should be able to see the following NMEA sentences:
$GPGGA,203901.000,2950.5123,N,09533.9439,W,1,11,0.9,32.5,M,-23.7,M,,0000*51
$GPGSA,A,3,23,20,07,16,03,06,32,19,13,10,08,,1.6,0.9,1.3*3A
$GPGSV,3,1,12,23,74,157,37,13,67,321,37,03,52,086,36,19,44,136,35*7F
$GPGSV,3,2,12,06,40,069,33,16,33,038,34,07,29,305,32,10,16,298,29*78
$GPGSV,3,3,12,20,15,202,26,08,08,288,25,32,06,180,18,11,02,168,*77
$GPRMC,203901.000,A,2950.5123,N,09533.9439,W,0.07,42.56,080611,,,A*49

Just to confirm, is the red light blinking on the device or is it steady on? Or, is it completely off?

If you tested it with GPSInfo and you see garbage characters coming out, then, the device has possibly switched to SiRF mode (http://www.usglobalsat.com/s-131-terms-conditions.aspx#12). To switch it back to NMEA mode, please refer to the instructions below:
 
1. Download and install this software: http://www.usglobalsat.com/store/downloads/SiRFDemo387.zip
2. Run the Sirf Demo software.
3. Connect your device, choose the correct COM port, and select the 4800 baud rate.
4. Go to Action > Open Data Source.
5. Next, go to Action > Synchronize Protocol & baud rate.
6. Then, go to Action > Switch to NMEA Protocol.
7. In the pop-up window, select the 4800 baud rate under the Baud Rate and click Send.
8. Close the Sirf Demo software.
Note: Be sure and not to click on anything else in this software, as you can render your device unusable.

Now, try your GPS Receiver with the GPSInfo Utility (http://www.usglobalsat.com/store/downloads/GPSInfo.zip) to see if the problem persists.