Sena SRL2 Mode D'emploi page 258

SRL2
The pairing diagram for GPS pairing is shown in the figure below.
Smart Phone
HFP
Mobile Phone
+
A2DP
SRL2
20
Pairing
HFP
GPS Pairing
GPS
GPS Pairing
4.4.2 GPS Pairing as Mobile Phone
If a GPS is not only used for turn-by-turn voice instructions but also is
your preferred Bluetooth stereo music source, you can pair the GPS to
the SRL2 by following the simple procedures in section 4.1, "Mobile
Phone Pairing" . However, since some GPS systems support mobile
phone bridging over Bluetooth, you can pair the mobile phone to the
GPS to use your mobile phone. When you do this, the SRL2 thinks the
GPS is a mobile phone so you can no longer pair your mobile phone
to the SRL2 directly. Please refer to the user's guide of your GPS for
details.
GPS
HFP
Mobile Phone
+
Pairing
(A2DP)
SRL2
GPS Pairing as Mobile Phone
HFP
Mobile Phone