<em>The answer is: your GPS unit cannot send signals to the satellite when it cannot reach it by line of sight.
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<em>GPS signals are based on frequencies that can be blocked by solid objects (like walls and roofs). A GPS device is using a series of satellites to detect and see where it is physically located. These frequencies are sent from these plates (satellites) and we cannot expect it to go through all kinds of barriers. When you use a GPS inside a building, a wide variety of physical barriers and potential interference sources make it difficult for the device to detect your location accurately.
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Peppa: Hello Susie!
Susie: *mehhh* Hello Peppa!
What are you doing?
Peppa: I'm learning to whistle,
but I can't do it yet.
Susie: Hmm.. that sounds hard.
Peppa: It's impossible!
Uh.. can you whistle Susie?
Susie: No
Peppa: *honk* Oh good! I mean-
that's sad if you can't whistle
but good because I can't whistle
Susie: What's whistling anyway?
Peppa: You put your lips together
and blow!
Susie: Like this? *whistles*
It converts the mic input into a string of raw data, then compares it to hundreds, even thousands of voice samples. The output is a polished string of data in words.
