I do believe you can create an extension to create this functionality yourself.I have thought about doing something similar, but this is something I won't be doing anytime soon myself.You can use the GPSConnection object to get access to the HDOP/PDOP values.Run a separate thread, or the GPSChanged event handler to check the HDOP/PDOP value and see if it drops below your threshold. If so then play a sound.You will need programming knowledge to do this.I hope this helps.
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