Answer to the third part of your post: Yes. We need it. It's a a question of quantity: the more the merrier. 24 GPS satellites + 24 glonass give you a better chance to have a minimum of 5 satellites "visible" and will improve the reliability of the system and finally give a better 3d location.
Also, this is old news since most GPS chips have been Glonass compatible for a while... I think the Iphone 4, was the first phone to carry one.
Until the more powerful European Gallileo system is introduced (if ever....), this is the best solution.







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