WAAS supplies two different sets of corrections:
- Corrected GPS parameters (position, clock, etc.).
This set of corrections is user-position independent and they apply to all users located within the WAAS service area.
- Ionospheric parameters.
This set of corrections is area-specific. WAAS supplies correction parameters for a number of points (organized in a grid pattern) across the WAAS service area. The userâs receiver computes ionospheric corrections for the received GPS signals based on algorithms which use the appropriate grid points for where the user is located. Further, the appropriate grid points may differ for each GPS satellite received and processed by the userâs receiver as the GPS satellites are located at various positions in the sky relative to the user.
The combination of the two sets of corrections allows for significantly increased accuracy and confidence of the user’s position anywhere in the WAAS service area.
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CLICK HERE for BC GPS Standards and Regulations