diff --git a/src/algorithms/PVT/gnuradio_blocks/gps_l1_ca_pvt_cc.cc b/src/algorithms/PVT/gnuradio_blocks/gps_l1_ca_pvt_cc.cc
index 6bc064349..4329d5c52 100644
--- a/src/algorithms/PVT/gnuradio_blocks/gps_l1_ca_pvt_cc.cc
+++ b/src/algorithms/PVT/gnuradio_blocks/gps_l1_ca_pvt_cc.cc
@@ -168,14 +168,40 @@ int gps_l1_ca_pvt_cc::general_work (int noutput_items, gr_vector_int &ninput_ite
 
     if (global_gps_utc_model_map.size() > 0)
         {
-            // UTC MODEL data is shared for all the GPS satellites. Read always at ID=0
-            global_gps_utc_model_map.read(0, d_ls_pvt->gps_utc_model);
+            // UTC MODEL data is shared for all the GPS satellites. Read always at a locked channel
+            int i = 0;
+            while(true)
+                {
+                    if (in[i][0].Flag_valid_pseudorange == true)
+                        {
+                            global_gps_utc_model_map.read(i, d_ls_pvt->gps_utc_model);
+                            break;
+                        }
+                    i++;
+                    if (i == d_nchannels - 1)
+                        {
+                            break;
+                        }
+                }
         }
 
     if (global_gps_iono_map.size() > 0)
         {
-            // IONO data is shared for all the GPS satellites. Read always at ID=0
-            global_gps_iono_map.read(0, d_ls_pvt->gps_iono);
+            // IONO data is shared for all the GPS satellites. Read always at a locked channel
+            int i = 0;
+            while(true)
+                {
+                    if (in[i][0].Flag_valid_pseudorange == true)
+                        {
+                            global_gps_iono_map.read(i, d_ls_pvt->gps_iono);
+                            break;
+                        }
+                    i++;
+                    if (i == d_nchannels - 1)
+                        {
+                            break;
+                        }
+                }
         }
 
     // update SBAS data collections