The infotainment hardware is based on the USB 2.0 spec and follows it exactly. The spec calls for fairly low power delivery, which is why you see the low amps and lack of charging when doing other things like GPS. It's a common issue in systems that had their hardware design frozen a few years ago.
Their roadmap calls for a new system in 2019 so its possible they will upgrade this. USB 3.0 allows a lot more power, or they could keep it as 2.0 (for whatever reason) but choose to deliver more power. My guess is they'll switch to 3.0 because going out of spec makes engineers nervous.
Their roadmap calls for a new system in 2019 so its possible they will upgrade this. USB 3.0 allows a lot more power, or they could keep it as 2.0 (for whatever reason) but choose to deliver more power. My guess is they'll switch to 3.0 because going out of spec makes engineers nervous.