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Couple pieces of advice.

Don't use COM4 for ANYTHING. Not Priming, not Google Maps, not GPSGate, it's flaky. If your app only supports com ports use GPSGate or similar.
Try the new GPS DLL's floating around. They seem to solve a few issues (Battery, Stuck GPS, Stuck Data Link).

Sometimes, depending on time of day and your environment it can take a few minutes to lock no matter what you do. Google maps will almost always say GPS Active(0) fairly quickly and have a blue dot with blue background (zoom out your near nigeria). If it does, you're golden, but you have to wait for sats. If you don't get the sats you gotta get better signal (go outside). If you don't get GPS Active (0) in say about a minute your GPS is probably hung. Reboot.