Then you engineer another source of correction and incorporate that into your project. The US Navy has been doing accurate position determination using ZERO sa

Then you engineer another source of correction and incorporate that into your project. The US Navy has been doing accurate position determination using ZERO satellite availability. How do you think a submarine knows where it is? http://www.liveleak.com/view?i=aba_1332656862 http://www.liveleak.com/view?i=aba_1332656862