GPS Is Fabulous, but I'm Hedging My Bets

GPS is the most remarkable navigation system that aviation has ever had, and it's going to get even better with the decomissioning of Selective Availability and the launch of a new constellation of L5-band satellites. But don't yank the VORs and DME out of your panel until you've read the cautions by AVweb's avionics guru about some of the limitations and problems associated with relying on GPS as your sole means of navigation.

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