I use a bluetooth gps for google maps etc (as I use an old phone that doesn't have gps built in)
this says you could put a wireless bluetooth receiver near the rear window? www.gpsoz.com.au/athermic.htm
"I have a Bluetooth GPS, can I place it on a back parcel shelf, or near another window ?
Yes you can, some people do this. Remember that Bluetooth data will only be sent over a couple of meters, so it's not ideal for all vehicles, but most cars when they do have an Athermic windscreen, do not have Athermic side or rear windows, so in most cases you could try this first before purchasing a patch antenna or a re-Radiating antenna."
Cheers Laim
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