diff --git a/src/core/system_parameters/gnss_satellite.cc b/src/core/system_parameters/gnss_satellite.cc
index f902fa49f..6b79db308 100644
--- a/src/core/system_parameters/gnss_satellite.cc
+++ b/src/core/system_parameters/gnss_satellite.cc
@@ -303,7 +303,7 @@ std::string Gnss_Satellite::what_block(const std::string& system_, uint32_t PRN_
                     block_ = std::string("IIF");  // Plane E
                     break;
                 case 4:
-                    block_ = std::string("Unknown");
+                    block_ = std::string("III");  // Plane A
                     break;
                 case 5:
                     block_ = std::string("IIR-M");  // Plane E
@@ -333,7 +333,7 @@ std::string Gnss_Satellite::what_block(const std::string& system_, uint32_t PRN_
                     block_ = std::string("IIR");  // Plane F
                     break;
                 case 14:
-                    block_ = std::string("IIR");  // Plane F
+                    block_ = std::string("Decommissioned");  // Plane F
                     break;
                 case 15:
                     block_ = std::string("IIR-M");  // Plane F
@@ -345,7 +345,7 @@ std::string Gnss_Satellite::what_block(const std::string& system_, uint32_t PRN_
                     block_ = std::string("IIR-M");  // Plane C
                     break;
                 case 18:
-                    block_ = std::string("IIR");  // Plane E
+                    block_ = std::string("III");  // Plane D
                     break;
                 case 19:
                     block_ = std::string("IIR");  // Plane D
@@ -360,7 +360,7 @@ std::string Gnss_Satellite::what_block(const std::string& system_, uint32_t PRN_
                     block_ = std::string("IIR");  // Plane E
                     break;
                 case 23:
-                    block_ = std::string("IIR");  // Plane F
+                    block_ = std::string("III");  // Plane E
                     break;
                 case 24:
                     block_ = std::string("IIF");  // Plane A