Routinely, my two GPS navigators will lock onto GPS satellites within a few minutes once powered up. But not this time. Both indicated LOI (loss of integrity), implying that the GPS satellites were insufficient. This was confirmed when no satellites appeared on the GPS Status pages. With the failure in two separate units, a failure in the airplane was unlikely. I suspected some systemic GPS problem.
Curiouser and Curiouser
Once I taxied perhaps 100 yards beyond the FBO, the satellites came alive one-by-one. Since I remain well practiced in VHF nav, and it was a local flight, I continued.
