Everything works in Apple CarPlay except navigation apps

jiskco what will happen if you disconnect the gps module at all? will the carplay use the iphone gps module only? so my iphone x gps nav is working great when not plugged in to the carplay but as soon as i plug it in and it is starting loosing signal... crazy.

If you mean using iPhone X as standalone navigation not connected to the head unit (Alpine ILX-107)... I don't have any issue. Car location is accurate.

If you mean disconnecting the head unit GPS antenna and use Wireless Carplay navigation... I have not done it.

As I stated earlier, this is an intermittent issue for me. Sometimes I'm getting accurate location, especially at the start of the trip, at the middle of the trip, I'm seeing a lag, the car (arrow icon) stopped moving and when it does, it doesn't adjust to its current location or jumps to 300 or so yard to the right or left of the current location. I honestly don't think this is an antenna location issue.

what will happen if you disconnect the gps module at all? will the carplay use the iphone gps module only?

It depends how you are connected to CarPlay and how the firmware of the device is written.

For a wired CarPlay connection, GPS support in the head end is optional.

For a wireless CarPlay connection, GPS support is mandatory.

Now, firmware comes into play, because if the phone is connected via a wire and the unit has GPS capability, if say the antenna is disconnected, the head end may just send incorrect data to the phone rather than tell it it has no data available.

On the other hand if the connection is wireless, the head end will send bad data to the phone because it's mandatory that it have GPS data to send.

I will try both experiments over the weekend.

Here's one more data point to this issue...

I rode with my carpool buddy this morning. Wired carplay on Ford Sync3. The same issue.

Waze reported inaccurate car location on few occassions, not all the time. Again, the head unit (Waze) screen navigation frooze/lagged when they happened.

I noticed this issue with Waze this weekend as well in a rental car. The app kept on redirecting me onto adjacent roads that I was not on. Not sure where it was trying to take me by the time I got to the airport. I thought it was an issue with the latest update. Good thing I was familiar with the route to Calgary airport. I didn't have time to test Google or Apple Maps to see if they worked. Unfortunately I do not have a CarPlay capable head unit in my car to further test.

Same issue here.

Never had had an issue using my iPhone X for navigation prior to connecting it to CarPlay for my first time today. While connecte, Google, Waze, and Apple maps and all kept losing my location. It would usually veer my car off the highway and just freeze there. This lasted 10 minutes or so. It also happened once on local roads.

In-car navigation system had me in the correct location.

As mentioned earlier, when connected to CarPlay, the phone usually relies upon GPS information sent from the CarPlay head unit rather than on internal data.

There may be a bug in your CarPlay head unit or other installation issue that prevents it from passing on proper positioning information.

It seems weird that it’s the car providing faulty info, because when it happens to me I can flip to the car GPS and it knows exactly where I am. Seems odd that it knows where I am but is telling the phone something else.

CarPlay is new to me but lots of reports online of this being an issue introduced in iOS 12.

I suppose it could be, but most of the complaints have been that the location is wrong when connected to CarPlay, and in CarPlay most of the time the phone gets its location information from the CarPlay head unit rather than the phone's internal GPS.

There could be a bug in how the phone is interpreting the location information sent to it, but if there was this issue would be far more widespread.

All I can relate is that within the last month I have been in two rental vehicles with CarPlay, both Hyundais, and both displayed a 100% accurate position on the CarPlay map for me.

Update on disconnecting the head unit GPS antenna:

Wired & Wireless Carplay we’re both giving wrong location. This time, it’s even worse as the location is way off my location. I drove for 10 miles and it seemed that the map is not loading correctly as the head unit was relaying random coordinates, in my opinion.

I hope in future IOS CarPlay update, this issue will be rectified. An option to select which GPS antenna to use (iPhone or head unit) will probably do the trick.

Disconnecting the head unit GPS antenna won't help, as the firmware of the head end would need to know there is no antenna and if one is not present, it would need to decline to provide positioning information.

As I stated previously, this is also only for wired CarPlay; for wireless the head end must provide positioning information.

What you saw makes sense as without the antenna, the head end couldn't receive a good GPS signal.

You misunderstood - the protocol allows the head end to decide whether or not to use a GPS antenna to provide location information to a CarPlay device connected via a wire.

The wireless connection protocol requires it to provide information.

The way this likely goes is the phone asks the head end whether it can provide GPS information when connected via a wire and uses its own information if the head end says no.

When connected wirelessly there is no choice.

So your test would only work if your head end was smart enough to tell the phone it could not provide information if the GPS antenna was not connected; it appears it is not.

What issue would be more serious than a gps that does not work?

I have the same problem, my car doesn’t have a gps and Maps, Google Maps and Waze doesn’t work when I connect the the phone to the car. I have an iPhone7 with iOS 12. 

If there are many users with the same problem, you should do a fix and I think the best way to fix that is that I can decide what gps use and if that generates more issues you should fix that issues too. 

These phone are not cheap so make it work. 

A quick update from me. So I updated my iPhone 5s to the latest ios 12.1.2 and the apps like waze, google maps and maps are all working great now. So i guess is not an iOS software problem it is more like a hardware used in the newer iphones. I think apple switched hardware providers especially for the GPS modules on the new iPhones. So all working great on my iphone 5s on is os 12.1.2 and nothing works on my iphone X on ios 12.1.2....

I have this exact issue. iPhone X running iOS 12.1.2. iLX-107. GPS antenna is mounted in suggested location and wire is routed as per Alpine instructions.

Apple Maps, Google Maps, and Waze all exhibit the problem. I've noticed that the trip starts out fine and after a few minutes, GPS becomes inaccurate. It's not wildly inaccurate like a different part of the world. It's just a few hundred yards off, which still makes navigation unusable. It's extremely frustrating. I've also noticed that it has real trouble recognizing that I've turned. When it's intermittently working it seems to be able to track my location when I'm headed in a straight line and as soon as I turn it shows me on the map continuing straight for a few seconds and then turning. Then it starts in with the "Proceed to the route" nagging or telling me to turn on a street that is several blocks away.