militairy use a system called NAVSOP (Navigation via Signals of Opportunity)
- http://www.baesystems.com/en/product/navigation-via-signals-of-opportunity-navsop#
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Location by triangulation
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militairy use a system called NAVSOP (Navigation via Signals of Opportunity)
- http://www.baesystems.com/en/product/navigation-via-signals-of-opportunity-navsop#