Ah right Clivia, i didn't realise that, thanks for that info.While using GPS Quickfix in this software it shows:
"Uploading GPS Quickfix data
Configuration URL: https://mysports.tomtom.com/service/config/config.json
Quickfix data URL: https://gpsquickfix.services.tomtom.com/fitness/sifgps.f2p7enc.ee
GPS Quickfix data sent to watch
Apparently, it retrieves quickfix data from the tomtom server, so not completely independent of TT?
I suppose it's a case of wait and see then.