HOOK:
Don't know why he paired his phone, but we have it turned off now and will try it again when the rains in SoCal let up.
The final test will be his LG GPAD on his RAM mount; my G Pad, which isn't affected, on his seat next to my Samsung TAB A tablet.
We'll see which fails and which continues to work.
Nav satellites transmit on 1575.47 Mhz and 1227.60 Mhz while Bluetooth used 2.4 Ghz so I can't see how the two can conflict.
This next test should provide more information.
John M