Quote:
Originally Posted by Andrew H.
aGPS uses a GPS chip and cellular or wifi data. It is better than a "standalone" GPS because the additional data helps with startup time and in conditions where reception from the satellites may degrade (trees, cities, valleys).
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Recently a hiker was lost in bad weather with icy rain and snow. He had a smart phone. I think it was an iPhone, but I am definitely not sure. He was looking for a crossing of a big stream. His phone with aGPS said it was where he was standing. It wasn't. He was talking to his wife on the phone and then the emergency responders. They said use the GPS. He said it isn't working. Finally he heard the emergency crews. (I admit I forget if they were in the air or on the ground.) He was talking to them. Finally he used the "light" from the phone screen to attract their attention.
So much for aGPS. I have seen other problems too. A good chip GPS doesn't usually have those problems.