Regarding breathalysers I wouldn't personally bother anymore.
This guys article sums it up pretty well.
http://www.drive-france.com/faqs/france-breathalyzer-law/
Secondly about the Sat Nav thing, I thought it was radar detection equipment that really got you into trouble. ie devices that can warn you of mobile or hand held speed guns.
I believe that most modern sat navs through big companies like TomTom are legal in France though I think you may have to turn the POI feature off. Tom Tom has a support page that you can use to put your make and model of sat nav in and it tells you if its OK for France or not.
Certainly I've heard stories of people having 1,500 euro fines and equipment confiscated though not heard of anyone having their car impounded.
I generally don't use my Sat Nav in France as these horror stories do scare me a bit.
Edited by Ditso on 07/08/2014 at 15:54
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