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.
Other posts in the GPS Tools series
- Simplifying GPS Tracks
- Recap Of Exporting/Importing GIS Data To/From A GPS Unit Series
- Freeware GPS Road Navigation Software
- GPS Satellite Display In Google Earth
- Solar GPS DataLogger
- Loading An AutoCAD DXF File Into A GPS Or Google Earth
- Open Source Web-Based GPS Fleet Tracking Software
- Determining Local GPS Satellite Geometry Effects On Position Accuracy
- Determining Terrain Effects On GPS Accuracy
- GPS File Format Converter
- “Turn Your Cellphone Into A GPS!”? Not Exactly, But Still Kinda Cool
- USAPhotoMaps: GPS Functions
- Java-Based GPS Route Format Converter
- RouteConverter Updated
- Create Location-Based Media (Games, Hikes, Tours, Etc.) With Mscape
- Protecting Your GPS Unit’s Screen
- Upload Google Maps Directions As A Route To A GPS
- Get-A-Route Upgraded Already
- Two Free Applications For Marine Navigation
- KML To GPX Converter For PC And Mac
- Creating GPS Routes And Tracks In Google Earth
- GPS “Dilution Of Precision” (DOP) Maps
- Real-Time GPS/WAAS Status Reports
- Cheap Bluetooth GPS Antenna And Data Logger
- Improving Position Measurement Accuracy In Consumer-Grade GPS Receivers - Part I
- Cheap Digital Camera With Built-In GPS
- Cheap GPS Antennas, Compasses, Oddball Gadgets And Junk
- Improving Position Measurement Accuracy In Consumer-Grade GPS Receivers - Part II
- RouteConverter Updated - Java GPS Route Editing And Conversion For Windows (Mac And Linux Too?)
- Sports Route Planning Software For The Macintosh
- OKMap - GPS Mapping Software For The Beta-Adventurous
- Create Bicycle/Travel Courses For Your Garmin Edge/Forerunner GPS With Bike Route Toaster
- Web App For Analyzing GPS Tracks


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.