GPS function independent of cell svc and wifi? XM?
I take long solo motorcycle trips and use a Garmin for GPS function, MP3 player and XM radio (subscription and ext antenna req). Long time iPhone user, though and the iPhone does this also, or at least can it?
My questions are:
1) Does the gps function independently, ie, outside of cellular coverage and wifi? I have read that it does and has an internal antenna for it. I have also read that that functioning is accessed only if the cell phone part of the device is turned on. It does not use the cell phone for it, but without it being on, no gps, Thus an iPad without phoning ability would not be able to function as a gps device, but if the iPad is also a phone, then it could.
2) Similarly, XM radio. Is there a separate antenna for it and does it function without cell cvg or wifi?
3) If there is an ext antenna for the XM on the iPhone, can the antenna and power cable be plugged in at the same time.
My understanding is that both gps and xm can work outside of cell and wifi and do not involve the data plan, but I can't find definitive info. Esoteric question I know, and when I posed it to Samsung re their Note 4 I got answers all over the board. My 4s is working fine now, but I see a 6+ or Note 4 in my future.
TIA
John