ndoggac

Funny that you just referenced a web site that I administer :-). While that page does have WAAS data decoded to a text output updated every three minutes, it is not a real time stream of the binary 250 bit messages that are broadcast from the WAAS GEOs every second. The SISNET service for EGNOS serves up a real time stream (think streaming radio) that contains the same messages broadcast from their GEOs. The Euro government org contracted this out and paid a lot of money to provide this service. WAAS has no similar online stream available.

Broadcom's new GPS chipset, the BCM4752 has SBAS capability (WAAS, EGNOS - unsure about MSAS & GAGAN, but they should work). I'm guessing this would lend to an accuracy improvement of the provided position, but it is unclear if any apps would be able to utilize or display WAAS specific data (ie - GEOs tracked, the GPS satellites you've received corrections for, etc). I would guess the best bet on Android would be the "GPS Status & Toolbox" app, but not sure if they support display of WAAS data. This chipset can be found in the Samsung Galaxy S4. Not sure it is in any other phones though. SBAS corrections are different from what is downloaded via A-GPS. A-GPS is almanac and ephemeris data for the GPS satellites to improve your time to first fix. Using GPS only, it might take 12 minutes or more to acquire this data since GPS bit-rate is so low. Downloading this data via your mobile data is much faster (on the order of several seconds). This information simply tells the receiver where in the sky to look (precisely), and for what satellite to look for in that spot. This can drop your time to first fix to seconds, rather than minutes. The GPS status app on Android has an A-GPS tool where you can manually force the download of this information. SBAS correction messages are 250-bits per second sent down from three geosynchronous satellites (currently PRNs 133, 135, 138 for WAAS). These PRNs might show up in some displays as 46, 48, and 51 respectively (subtract 87). These are the NMEA satellite values. These messages provide corrections for sources of GPS error (satellite clock drift, satellite ephemeris, ionospheric error, tropospheric error, system time corrections, etc). The messages also include ephemeris data for the system's GEOs, so they can be used as a ranging source similar to GPS satellites. Currently there are no internet sources for WAAS real-time correction data. EGNOS has SISNET, where you can stream the 250 bps over the internet rather than acquiring it from their geosynchronous satellites. No apps that I know of utilize the online stream and integrate the corrections, but EGNOS put out a dev kit, so the apps might be coming.