the only gps devices you should worry about are the ones with back to base security fitted with them as they transmit info the your security provide when car has been stolen within the activated duration of the security system and also if you hit the panic button. this method will transmit the car location, time, speed, direction and even have an option to remotely immobilise the car from back to base by your security firm. whether the firm has strict policy on sharing info with authorities or third party varies but you never know how easy it can leak.
as for normal gps car navigation, there's nothing to be worried about. all it does is gather your gps coordinates from the satellite and calculates your trip. there's really no secret transmission to Mars.
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