The problem with Garmin Automotive Devices like the Drivesmart 66 is that they are setup to link to smartphones or backup cameras.
There is nothing in the setup that will let you use any Bluetooth ear phones much less Cardo headset that are used with helmets when on a motorcycle.
I have a Drivesmart 66 and even tested a couple of ear buds and none of they are compatible with this unit GPS series.
Do not think it is legal to have ear phones on while driving a car I could be wrong.
Where the Garmin Zumo series was setup for motorcycle users.
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