The easiest way to test out your interface is to use Motorola's WinOncore Software. This software provides a GUI for checking the satellite signal, shows the satellite positions, and has a Lat./Lon. grid display that tracks your position. You can also switch from Motorola Binary to NMEA mode, run gps diagnostics, and get the reciever ID and serial info from your Oncore. (This link was removed from Motorola's site -- Thanks to Chris Kayes for pointing out that we can get this stuff from the The WayBack Machine)
On my resources page, I have provided links to several web resources that will walk you through the Motorola Binary format, or how to switch your GPS to NMEA mode via QBasic, DOS ,or your terminal software. Note - when you switch the Oncore to NMEA, the OnStar indicator light in your vehicle will turn red. After you switch it back - it will go back to green.
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