Why is the sound perfect when connected to my SatNav, but non existent at all other times?

When travelling the Swees android is connected to the satnav for safer driving. Sound between the two at this time is loud and clear, but when in a pocket or hand held, the sound is really. bad. I can just about hear the caller but they can't hear me. I suppose that should be a blessing as far as they're concerned, but it just makes me want to fly the phone off the nearest clay trap! Any help would be appreciated.

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