I am aware that an additional gps system can be used along-side intercom.
However, because I and many others use a phone for gps I.e Google maps, I cannot hear the gps when in intercom mode. this means that I have to keep switching back to my phone to hear the gps directions and switch back to resume a conversation.
I love the smh10 but it should be possible to have a setting for phone audio feed through even if it does interupt for a second to tell me where I'm going!
This is the only frustrating thing about my rides when I have passenger.