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StreetPilot® 2820 Compatibility with Helmets/Headsets
Garmin strives to maintain Bluetooth compatibility with the most popular motorcycle and truck headsets on the market. Currently, as long as the headset supports the hands-free profile and has a Bluetooth version of 1.1 or higher, it should be compatible, although it cannot be guaranteed.
The StreetPilot® 2820 has a 3.5mm headphone audio jack on the device as well as Bluetooth. When your device is paired to your Bluetooth headset, you will hear all the audio in the Bluetooth headset. You will only hear the audio in the connected wired headset if your Bluetooth headset is not paired to your device.