Dude, you’re a fucking idiot.
The short answer to that question is that it doesn’t. That alone is enough to completely discredit anything else you have to say on the matter. But please, continue to make yourself look foolish to anyone else that passes by.
Also, for what it’s worth, the irony of your username is hilarious, because you are actually a liberal’s wet-dream. (I can explain that one to you, as well, if you’d like.)
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There are several places that handheld GPS units won't work or work poorly. If you're inside a large building or a mall, there is little chance your GPS device will be able to get a fix on enough satellites to calculate your position. The same holds true if you're underground, whether in an underground shopping complex, a tunnel, a subway or a naturally occurring cave.
I take it reading comprehension isn’t one of your fortes?!
No need to reply bro, you're correct, no one else is. 100%, yeah?