Agree with elDubDub. Must have hard connection for Apple Car Play. This allows me to view navigation on the 8" screen. In my 09 Forester, I had the Navi deck and could always see the map when driving everywhere. I really do miss this feature.
With the 2019, I have to connect the cable everytime and hit the Car Play button to see the Navigation. Also, can't add or change the route when driving on the 8" monitor, but you can do it on the iPhone. So, I have my phone mounted to the glass with suction cup.
I used it this way in the 09 Forester and much prefer this option. The manual says not to do this because of eyesight, but I have done it this way for 3 weeks now and there is no adverse affect to Eyesight and I use the lane assist feature quite often.
For the cable solution I really do not like a hanging cable in front of the LCD screen and just dangling. So, I ran a 10ft hidden iphone cable. I did not want to alter or drill any holes into the trim panel. So, I explored a bit. In the USB bay area there is an LED lamp that turns on with the headlights. It is very dim and not bright enough to see the USB ports. So, I removed it, ran the USB cable through this hole then ran the cable under teh dash, up the left pillar trim and tucked under the headliner. The cable comes out at the center between the eyesight cameras and I hid it in the cable guide where the Homelink mirror cable is located.
Works great and looks great. Now I can mount my phone to the Topeak Car Adapter, plug it into the USB cable and use Car Play navigation and audio features. When I leave, I take teh phone and have the same ToPeak iPhone XS case that mounts to my road or mountain bike. One case, one mount, many places to drive and ride!
The first photo shows the ToPeak window mount just under the radar detector (mounted to mirror arm, not window). the USB cable is long enough so I can connect and set the phone on the top dash area. Or I tuck the cable under the clip for the radar detector like you see it in the photo. This keeps the cable out of the way.
The second photo is from the front of the car. You can see the window mount, the radar detector and the cable tucked into the detector clip. This is nice and neat and out of the way.