Dells, please see my reply above, unless your car has a WiFi network (as do some BMW’s I have been told) you do not have Wifi in your car, in your house if you have internet, you should have a WiFi connection, bluetooth is not the same tech.
I know WiFi and Bluetooth are not the same I can only repeat what the manufacturer told me and what I see in settings
It seems to me that when you’re using an app on the phone, the HF or A2DP BT profiles are connected to the HA. When you switch to using the app in the car, it’s going to use the car audio resources, making the assumption that you’re in the car you want to use the car audio resources rather than your headphones.
If you think about it, the average BT headphone user is not allowed to use their headphones in the car. It may be different with using a BT one-eared headset, but the audio assumption in a mapping program is that it’s going through the standard audio which would be A2DP in BT which would mean a 2-ear headphone which would be illegal to use in the car.
I sincerely don’t think it’s a limitation of BT; the app or the system could decide to use whatever audio routing it wanted, assuming it had the OS resources to make that decision. But most designers don’t want to screw around with considering the extra use cases and extra GUI issues to support this.
All the apps that I’ve seen use the default audio connection when running on the phone, and use the car audio when running in/with the car.
The one exception I’ve seen is my Android Phone app for phone calls. Once you’re in a call it lets you select manually between BT car, BT headset (or HA as the case may be), handset, or phone speakerphone.
So I agree with mwsumner: working as designed. It’s too bad they don’t have more options. The options may have been available (since the Android Phone app can do it), but the developers just didn’t want to go to that level of effort, largely IMO because the only use case they could envision would have been illegal (2-ear headphone).
Hi Haggis
Thanks for the explanation, so the fact that I set phone to use Bluetooth Headset in call audio routing and set the map app to use Bluetooth as Bluetooth phone call is ignored if this is the case then why should it work with wireless ear pods ?.
Dell
Just to add when I make a phone call through CarPlay the sound comes to my aids, it’s only when I am using navigation app I don’t get sound to them.
This is what I would expect.
Can you restate this? I can’t quite follow it. Is this theoretical or what you’re actually setting?
Okay Haggis
On my iPhone 8 IOS 13 I have set call audio routing to use Bluetooth Headset, on the navigation app I have set to play sound via Bluetooth as Bluetooth phone call, when I am connected to CarPlay if I make or receive a call the sound comes to my hearing aids as it should, if I open navigation app out of the car voice directions come to my aids as I would expect, but as soon as I am connected to CarPlay I don’t get sound to my aids or car speakers, although I think it should, I only get sound through car speakers when I turn on AUX as it should.
But if I use wireless ear pods ( I haven’t got any they are my sons) it all works as I expect it to with my aids.
I always thought that CarPlay was just an extension of my phone.
I hope that makes sense.
Dell
Perfect sense, thank you. So I am as perplexed as you. Apparently, the iPhone can distinguish between AirPods and BT HAs, and it “deprecates” the HA’s inasmuch as it prefers going to the car bluetooth when connected and having to choose between BT devices. But why, I don’t know. Some idiosyncratic assumptions in the programming. Maybe CYA safety based.
That what I can’t understand as car Bluetooth switched off and CarPlay Bluetooth not connected as it uses WiFi once connected,I have checked this in settings.
When I start car CarPlay Bluetooth connects then it connects to WiFi and it drops Bluetooth
What’s the source of the car’s “wifi?” Can you log into it with your phone or laptop?
Not sure about that maybe if I had the login credentials but I haven’t all I can see is in WiFi settings it has connected to CarPlay.
I see online that CarPlay does support Wifi, but if I’m understanding correctly, CarPlay is a feature on your car’s radio/GPS. I think the only way to sort this out is pouring over a manual specific to the device or calling tech support.
It still boils down to the decisions the software makes in how it routes its audio. Since from what you said earlier that you’ve proven it has the ability to go either way – to the car or to your AirPods – there is no technical principle (like BT vs. WiFi) behind why it is or isn’t connecting to your HA’s. It’s just some kind of arbitrary decision deep in the software somewhere and Apple support isn’t going to know anything about that. Most people won’t say they don’t know, though, so you should get some interesting, outlandish myth from them about why it happens. Like the “Bluetooth is very conflicted. It’s Blue.” (This is the kind of response I’ve received from Apple support several times over the years.)
It’s an aftermarket CarPlay and I have connected manufacturer but he hasn’t got back to me yet.
Already connected Apple and that was like banging my head against a wall ( it’s nice when you stop)
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Yeah, don’t hold your breath for that aftermarket manufacturer, either. They have probably private-branded a contract-manufacturer’s generic product which was developed by a subcontractor and programmed by programmers who left it undocumented and are doubtless inaccessible.
Cynical? Me?
I know the manufacturer he will get back to me but weather the outcome will be positive or not remains to be seen.
And at the end of the day it’s not the end of the world but it would be nice to sort it out.
I have also connected phonak as I understand there is a software update for my marvels don’t know if it will help but worth a try, but I have had enough of my audiologist and I don’t want him in my house again, do you know if it’s possible to update them myself?
Dell
I hear you. I love to figure out how these systems work and really need to know why something doesn’t work. I’m just often disappointed. 
Yes, there is a firmware update for the Marvels. It affects BT, but hard to say if it would affect your situation, but it might. It also lets you use the new MyPhonak app with more features and self-defined programs with limited program modifications.
Re: self update: do you do any HA programming currently? What I gather is you need a “Noahlink” wireless interface unit (available here), and “Target” software for the PC (not sure where you get it). Then you’d need to get the firmware file itself, though I think I saw it floating around somewhere on this forum.
I wouldn’t try it if you haven’t done any HA programming before and if you just want the update. But if you wanted to get into HA programming, go for it. There was a “DIY” thread I keep hearing about but I haven’t looked for/at it. It should help you get started.
Thanks for that I know I need a Noahlink I will have to do a bit of googling.
One can ask for the software here DIY - Self Programming, How to Find Fitting Software Target will update itself and the firmware on the aids and any accessories.
And this link will take you to the latest DIY posts.
https://forum.hearingtracker.com/c/hearing-aid-self-fitting-and-adjusting
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Many thanks Dusty
I will have a read when I have a few hours to spare but before I do anything I will have to look for a Noahlink as I am in UK so the link haggis posted will probably cost to much to ship but will contact them to see.
Dell