Everything works in Apple CarPlay except navigation apps

Feel free to move to Android, but note Android Auto also gets its location information from your car's head end unit and thus will likely also show the wrong location.

Android is not really an option for BMW owners (they are working on it though)

Also, some people just like iphones better and would like for this problem to get resolved

ios 12.3.1

iphone x

acura RDX 2019

• waze temporarily loses my location - doesn’t recognize I am moving or turning - arrow noting my car disappears.
• google maps shows I am heading in opposite direction

Feel free, but as I mentioned just last week I made several 2+ hour drives and never had my CarPlay maps wander off of where they should have been.

G1Ravage, what's an "SD navigation card"?

A lot of cars hold their navigation maps and info on an SD card, rather than a DVD, or a hard drive installation.

Interesting. Thanks. I don't think my Accord has that as I have to update by USB.

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.

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.

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.

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.

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.

I popped my sim into an iPhone 6 running iOS 11 this morning to see what happened and I had the same issues. My next step is moving the gps antenna. I’ve read that metalized windshields could cause problems but I don’t think my 2015 Outback has one. The antenna is close to the windshield wiper and there is a speaker in the dash near the A pillar, so maybe metal or magnet is causing interference. I’ll test a few locations and see if it makes a difference.