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:               0.1.1
+version:               0.1.2
 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
@@ -27,13 +27,13 @@
 toGPSTime :: GpsObservationHeader -> ObsGPSTime
 toGPSTime hdr = ObsGPSTime
   { _obsGPSTime_tow = hdr ^. gpsObservationHeader_tow
-  , _obsGPSTime_wn  = 1874
+  , _obsGPSTime_wn  = 1875
   }
 
 fromGpsObservationHeader :: GpsObservationHeader -> ObservationHeader
 fromGpsObservationHeader hdr = ObservationHeader
   { _observationHeader_t     = toGPSTime hdr
-  , _observationHeader_n_obs = fromIntegral $ hdr ^. gpsObservationHeader_n
+  , _observationHeader_n_obs = 0x10
   }
 
 toP :: GpsL1Observation -> GpsL1ExtObservation -> Word32