WAAS Data

GPS/GNSS Development Boards
1

Is it possible to get the WAAS correction data from any of these GPS modules? In other words, is there an “extended” NMEA sentence that one can access to obtain the GPS corrections that were decoded from the WAAS satellite? I looked at the SiRF manual but could not find any such info. I think Garmin has a proprietary NMEA sentence that provides this information, but how about the others?

Thanks!

2

Sirf chips provide 50bps navigation frame messages. The messages from WAAS satellites contain the correction information, but you have to get into binary mode to access them. Decoding 50bps messages is not for the faint of heart.

  • John

www.precision-gps.org

PS. I think the Gps Tool Kit has code to decode navigation frame messages., as does the code on my website.