What a relief! I am really pleased that you found a solution that works for you.
From all the Googling around I did it seems there is definitely a .NET 2.0 SerialPort class issue with the built-in GPS on the P3300 as other .NET based apps have the same problem. I found one person who had contacted HTC and was told that they would only provide support for TomTom so he was on his own with third-party GPS apps.
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