I have a 2010 F-150 with an Alpine iLX-F509 receiver using CarPlay. Intermittently, and currently, the GPS shows me traveling in the opposite direction that I'm heading which makes the directions completely useless. Happens regardless of wired or wireless connection. Once I unplug from the USB or disconnect from Bluetooth, the map and directions in my iPhone 13 work normally. When plugging back in, even if I've removed the car from CarPlay and reinstall it, the problem comes back. This seems to be a problem with communication between my phone and my truck GPS. Is this a software problem with CarPlay or with the Alpine system? The firmware on the Alpine is current. Could this possibly be a problem with compatibility or my GPS antenna? I do not seem to be having the same issue with my wife's 2020 CR-V. All other features of CarPlay seem to be working fine. It's just the map and the GPS. Doesn't matter which map I use either (Apple, Google).
Carplay GPS issues
My suggestion would be to start investigating this through the CarPlay device manufacturer. Seeing it only happens with your truck, and with various mapping apps, the root source of the issue is likely the CarPlay unit, and the manufacturer might have heard of this issue before.
Thank you. Did this and the feedback I got was that the GPS cable may be getting some interference from other electrical components. I’m going to have to have the installer take another look at this.
Follow up - The issue seems to be avoided if I wait for the truck GPS to connect to the alpine system before plugging in the phone. I live in a semi remote area and usually have to drive to the front of the neighborhood before the system announces “GPS connected.” When I connect my phone and CarPlay engages the phone switches over to the truck GPS without any issues.
On the other hand, if I plug in and initiate CarPlay before the GPS connects, the phone can’t switch correctly to the truck GPS.
I don’t know if this is a CarPlay bug or if it can be fixed, but either way I have a solution.