Find out what version you have under More...->Help->About once inside program.
You can get english TTS from post #67 [Only registered and activated users can see links. ]
Since you have already put speedcam on it, you know how to access .../content/voice folder and put the *.zip under it.
Assuming that your Nav unit already have some sort TTS engine installed. You should be able to pick the english TTS voice from Setting->Sound and Warnings->Voice Language
Then you need to find Speedcam settings (Setting->Sound and Warnings->Alert Point Settings->Alert Type) and activate it so it will voice announce instead of beeping. Play around with it, I don't have android phone with me right now to tell you exactly where.
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