Gps "don't fly here"

[Sean McPherson]

Check out the notice about GPS affecting testing in the southwest & a notice for certain planes to avoid the area (!!!).

http://www.avweb.com/avwebflash/news/GPS-Interference-NOTAM-For-Southwest-226365-1.html

I want my planes to fly after an EMP, thanks.

Sean

[Patrick Joyce]

Eh. We already had at least one of those NOTAMs near us in Southern Indiana a few weeks back. I flew during it, the GPS worked fine. If it hadn't, there's the VOR radio navigation, if that doesn't work, there's a compass and a watch, and the fallback of landmarks. The first two methods would work for airlines, the last might be a bit tricky for them to pull off from 30,000 ft.

The plane that is recommended to avoid the area has a GPS-only derived AHRS (Attitude Heading Reference System), which replaces the instruments that tell a pilot what straight and level is and which direction the plane is pointing. Pretty important when you're in a cloud.