I just bought a Sena 20s bluetooth headset, believing it would be a sensible replacement for the Sena SMH10 I have that is failing. Unfortunately, I am having problems pairing it with my Garmin Zumo 665. The 665 is more than just GPS; it is also an MP3-player, XM radio source and a phone-bridge. In order for all those features to work, the 665 has to be paired as the 1st phone, as only the first phone can handle both the HFP-protocol (for navigation and phone) and the A2DP-protocol for stereo music.

Try as I might, I cannot successfully pair the two. Sena and Garmin haven’t been much help. Has anyone else had a similar problem or a solution for this?

If you have a Zumo 665, what Bluetooth headset are you using that does work properly?