Reading Snowden's new book has got me thinking.
I bought a portable gps device, a Garmin ETrex20, lightly used, slightly older (2011 vintage).
I know the government can intercept your cell phone but let's say you are in the wilderness, as I will be next week, which is actually in the radio quiet zone, so there's no cell towers or other things around.
If I didn't have my cell phone, let's say, could the government track me just from the Garmin GPS device alone. Could they know my location from that if they wanted to?
Can they know my location from my cell phone alone, even in the wilderness, if I have that? Just asking out of curiosity.
Could they simply pick up my location on some sort of satellite or infrared even if I had no electronics with me?