diff --git a/src/core/system_parameters/gps_almanac.cc b/src/core/system_parameters/gps_almanac.cc
index acf7068b0..c2776dcce 100644
--- a/src/core/system_parameters/gps_almanac.cc
+++ b/src/core/system_parameters/gps_almanac.cc
@@ -37,6 +37,7 @@ Gps_Almanac::Gps_Almanac()
     i_satellite_PRN = 0U;
     d_Delta_i = 0.0;
     d_Toa = 0.0;
+    i_WNa = 0;
     d_M_0 = 0.0;
     d_e_eccentricity = 0.0;
     d_sqrt_A = 0.0;
@@ -44,6 +45,7 @@ Gps_Almanac::Gps_Almanac()
     d_OMEGA = 0.0;
     d_OMEGA_DOT = 0.0;
     i_SV_health = 0;
+    i_AS_status = 0;
     d_A_f0 = 0.0;
     d_A_f1 = 0.0;
 }
diff --git a/src/core/system_parameters/gps_almanac.h b/src/core/system_parameters/gps_almanac.h
index d3628059e..57288d3db 100644
--- a/src/core/system_parameters/gps_almanac.h
+++ b/src/core/system_parameters/gps_almanac.h
@@ -44,17 +44,19 @@ class Gps_Almanac
 {
 public:
     uint32_t i_satellite_PRN;  //!< SV PRN NUMBER
-    double d_Delta_i;
-    double d_Toa;             //!< Almanac data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
-    double d_M_0;             //!< Mean Anomaly at Reference Time [semi-circles]
-    double d_e_eccentricity;  //!< Eccentricity [dimensionless]
-    double d_sqrt_A;          //!< Square Root of the Semi-Major Axis [sqrt(m)]
-    double d_OMEGA0;          //!< Longitude of Ascending Node of Orbit Plane at Weekly Epoch [semi-circles]
-    double d_OMEGA;           //!< Argument of Perigee [semi-cicles]
-    double d_OMEGA_DOT;       //!< Rate of Right Ascension [semi-circles/s]
-    int32_t i_SV_health;      // SV Health
-    double d_A_f0;            //!< Coefficient 0 of code phase offset model [s]
-    double d_A_f1;            //!< Coefficient 1 of code phase offset model [s/s]
+    double d_Delta_i;          //!< Inclination Angle at Reference Time (relative to i_0 = 0.30 semi-circles)
+    double d_Toa;              //!< Almanac data reference time of week (Ref. 20.3.3.4.3 IS-GPS-200E) [s]
+    int32_t i_WNa;             //!< Almanac week number
+    double d_M_0;              //!< Mean Anomaly at Reference Time [semi-circles]
+    double d_e_eccentricity;   //!< Eccentricity [dimensionless]
+    double d_sqrt_A;           //!< Square Root of the Semi-Major Axis [sqrt(m)]
+    double d_OMEGA0;           //!< Longitude of Ascending Node of Orbit Plane at Weekly Epoch [semi-circles]
+    double d_OMEGA;            //!< Argument of Perigee [semi-cicles]
+    double d_OMEGA_DOT;        //!< Rate of Right Ascension [semi-circles/s]
+    int32_t i_SV_health;       //!< SV Health
+    int32_t i_AS_status;       //!< Anti-Spoofing Flags and SV Configuration
+    double d_A_f0;             //!< Coefficient 0 of code phase offset model [s]
+    double d_A_f1;             //!< Coefficient 1 of code phase offset model [s/s]
 
     /*!
      * Default constructor
@@ -71,6 +73,7 @@ public:
         ar& BOOST_SERIALIZATION_NVP(i_satellite_PRN);
         ar& BOOST_SERIALIZATION_NVP(d_Delta_i);
         ar& BOOST_SERIALIZATION_NVP(d_Toa);
+        ar& BOOST_SERIALIZATION_NVP(i_WNa);
         ar& BOOST_SERIALIZATION_NVP(d_M_0);
         ar& BOOST_SERIALIZATION_NVP(d_e_eccentricity);
         ar& BOOST_SERIALIZATION_NVP(d_sqrt_A);
@@ -78,6 +81,7 @@ public:
         ar& BOOST_SERIALIZATION_NVP(d_OMEGA);
         ar& BOOST_SERIALIZATION_NVP(d_OMEGA_DOT);
         ar& BOOST_SERIALIZATION_NVP(i_SV_health);
+        ar& BOOST_SERIALIZATION_NVP(i_AS_status);
         ar& BOOST_SERIALIZATION_NVP(d_A_f0);
         ar& BOOST_SERIALIZATION_NVP(d_A_f1);
     }