I think I actually figured out what this was finally.
Do you have the RNS 510 satellite nav?
I figured that when you have 0 sattelite signal it does this sound.
This occurs when I'm out on a long drive and when im deep underground carpark and the satellite signal is 0.
You can press the MAP button and find out how many satellites you currently have on your case!
Am I right? Please confirm / deny
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