I have tried "GPS Pairing" and "Media Selective Pairing - A2DP" modes. I have reset the GPS and he 11B devices. In the procedure then GPS screen shows that the 11B is detected and asks the user if they want to connect. After pressing "yes" to connect there is a "connecting" message on the GPS but the LED flashing on the 11B does not change. Also when using the GPS is says "headset not connected". I have looked into the GPS config file (binary data) and it shows the 11B and it's MAC address recorded. Somehow the final part of the handshake fails.

On another helmet I have an Interphone device which does connect to the GPS. I have an Android phone which can connect to both the GPS and the 11B.

I'm looking for any ideas please.