diff --git a/gnss-converters.cabal b/gnss-converters.cabal
--- a/gnss-converters.cabal
+++ b/gnss-converters.cabal
@@ -1,5 +1,5 @@
 name:                  gnss-converters
-version:               0.1.8
+version:               0.1.9
 synopsis:              GNSS Converters.
 description:           Haskell bindings for GNSS converters.
 homepage:              http://github.com/swift-nav/gnss-converters
diff --git a/src/Data/RTCM3/SBP.hs b/src/Data/RTCM3/SBP.hs
--- a/src/Data/RTCM3/SBP.hs
+++ b/src/Data/RTCM3/SBP.hs
@@ -41,9 +41,9 @@
     }
 
 toP :: GpsL1Observation -> GpsL1ExtObservation -> Word32
-toP l1 l1e = round $ p * 100 where
+toP l1 l1e = round $ p * 50 where
   p = (0.02 :: Double) * fromIntegral (l1 ^. gpsL1Observation_pseudorange) +
-      299792.458 * 0.5 * fromIntegral (l1e ^. gpsL1ExtObservation_ambiguity)
+      299792.458 * fromIntegral (l1e ^. gpsL1ExtObservation_ambiguity)
 
 toL :: GpsL1Observation -> GpsL1ExtObservation -> CarrierPhase
 toL l1 l1e = CarrierPhase
@@ -51,7 +51,7 @@
   , _carrierPhase_f = fromIntegral lf
   } where
     p = 0.02 * fromIntegral (l1 ^. gpsL1Observation_pseudorange) +
-        299792.458 * 0.5 * fromIntegral (l1e ^. gpsL1ExtObservation_ambiguity)
+        299792.458 * fromIntegral (l1e ^. gpsL1ExtObservation_ambiguity)
     lm :: Double
     lm = p + 0.0005 * fromIntegral (l1 ^. gpsL1Observation_carrierMinusCode)
     l = lm / (299792458.0 / 1.57542e9)