Is there an aeroplane mode on viviactive 4

I believe so.  Same if you go to Sensors&Accessorites - it will try to connect to all paired sensors, so checking there doesn't tell you what was connected before, as going there tries to connect.

BT scanning takes battery so it only occurs when the user is doing something that may require it.  

Thanks Jim. 

Is BT then essentially switched off until triggered by the widget, activity or sensors menu or is BT just in a passive ON state without active connections? Much like switching the BT icon from the iOS control centre, which just disconnects devices and doesn't switch off the actual radio

this is very serious and not at all according to the device manual... 

Is this true Garmin-AmberD?

Gonna need an answer here Garmin-AmberD ...is it true? 

Martin said:

Much like switching the BT icon from the iOS control centre, which just disconnects devices and doesn't switch off the actual radio

https://youtu.be/HB_OYdoFwf8 

Dr. Joel Moskowitz from U.C. Berkeley:

“Moskowitz warns that more than 200 scientists from who study the effects of electromagnetic fields believe that the FCC guidelines are inadequate to protect human health;

‘It’s like we keep rediscovering that Bluetooth is harmful and trying to forget it because we don’t know how to handle it from a public policy standpoint.'

• This is way it is important to understand WHEN and WHY this device activates the bluetooth radio...

Anybody in the Garmin company who wanna tell their customers if they are unwittingly carrying a live searching radio emitting device on their body....

Huawei got no problem being honest... Got an answer in the first email.... "this devices carry a radio transmitter that can not be turned off" 

When I ask garmin;

Garmin-AmberD said:

Hello! Here are the steps to disable the Bluetooth manually!

You can turn off the Bluetooth smartphone connection from the controls menu.

Im clearly not talking about the phone connection as seen in the Actual topic of the thread that reads;

don’t want it just for flight ha but also to minimise radiation exposure.

If you are concerned about this (which I think most customers, including me, aren't), you could use a mobile phone or computer to search for nearby bluetooth devices, and see if the watch shows up. 

Ask on reddit in r/garmin. Reddit has some right wizards who will know about this, report back

Any news?

Yesterday i made a test with bluetooth. With bluetooth usb dongle you can sniff bleutooth pakets.

If you disable watch telefon bluetooth, you wont recieve any pakets anymore. If you enable it, bamm, packets.

So is the bluetooth hardware realy disabled? In which state is it?

Thanks