GPS Isn't Very Secure. Here's Why We Need A Backup Ifeadi C. 00:05 Feed: All Latest, Zero Tech Blog The 24 satellites that keep GPS running in the US aren't especially secure. So private and federal groups are working on alternatives. via Zero Tech Blog Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsThis grandma actually printed out email jokes and saved them in a bookWe never in a million years could've guessed why David Schwimmer was trending today'Scrabble' adds 'emoji' and more words to its official dictionaryMerriam-Webster calls out Neil deGrasse Tyson for being a grumpy old manIs the Apple Pencil Worth $99?Pixar powers on a new trailer for 'Incredibles 2'