stck4evr's Full Review: Cobra Electronics ESD 9860 Radar Detector
I had this radar detector for few weeks and I noticed that the compass is very flaky. You are supposed to calibrate it, which I did a few times. However the compass is still unstable - it shows South every few seconds when you are driving North, or ES instead of E, WS instead of W, etc. This is very annoying, and leads to many comments, if you have passengers in your car - I wish there was a way to turn the compass off.
As far as the smart mute - the way they derive your RPM speed is from the frequency coming from your alternator through the power cable. However, I noticed, that if I turn the music with some base on really loud, the base messes it up, and the detector thinks you are reving the engine, even if you are parked. Therefore it does not mute anything then.
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