Not too long ago, I posted about a site that offers maps of GPS Dilution of Precision (DOP) for the US and the world for the next three days. The FAA’s WAAS test team has a website that offers both similar and complementary data. In addition to having maximum DOP maps for the current day, similar to the other site, it has real-time maps of the current DOP across the US:

The actual delay in GPS signal due to ionospheric conditions:
And the current real-time positions of all GPS/WAAS satellites above the earth, along with their status:

Along with many other GPS-related graphics and technical reports as well.
Related posts:
- Improving Position Measurement Accuracy In Consumer-Grade GPS Receivers – Part II
- Can You Use GPS Data To Make A DEM?
- Stormpulse
- GIS Data For US National Parks And Monuments
- Plot Demographic Data In Map, Graph, And Tabular Format With PolicyMap
- GPS "Dilution Of Precision" (DOP) Maps
- Real-Time GPS Tracking For Google Earth – Free Options II
- Google Earth Gets Live Weather, Sort Of
- Real-Time GPS Tracking For Google Earth – Free Options I

I may just be too dense, but I don’t see a link to the site. ;-)
D’oh! Left it out by mistake, now it’s there. Thanks for the catch.