The best replacement for waas is dgps.

The best alternatives to waas are rated as following:
★★★★★  dgps
★★★★  riverbed
★★★  non waas
★★★  sirf
★★★  laas
★★  egnos
★★  normal gps
★★  raim
★  rtk
★  glonass
★  waas express
★  sbas
★  rnp
  omnistar
  riverbed steelhead
  branch repeater
  sirf iii

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Google Trends

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waas
dgps
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