diff --git a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
index 1422077ab..7be768a89 100644
--- a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
+++ b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
@@ -337,6 +337,8 @@ int hybrid_observables_cc::general_work (int noutput_items,
                                                     d_dump_file.write((char*)&tmp_double, sizeof(double));
                                                     tmp_double = current_gnss_synchro[i].PRN;
                                                     d_dump_file.write((char*)&tmp_double, sizeof(double));
+                                                    tmp_double = current_gnss_synchro[i].Flag_valid_pseudorange;
+                                                    d_dump_file.write((char*)&tmp_double, sizeof(double));
                                                 }
                                     }
                                     catch (const std::ifstream::failure& e)
diff --git a/src/tests/unit-tests/signal-processing-blocks/libs/observables_dump_reader.cc b/src/tests/unit-tests/signal-processing-blocks/libs/observables_dump_reader.cc
index 0773a5613..b9fc79d70 100644
--- a/src/tests/unit-tests/signal-processing-blocks/libs/observables_dump_reader.cc
+++ b/src/tests/unit-tests/signal-processing-blocks/libs/observables_dump_reader.cc
@@ -43,6 +43,7 @@ bool observables_dump_reader::read_binary_obs()
             d_dump_file.read((char *) &Acc_carrier_phase_hz[i], sizeof(double));
             d_dump_file.read((char *) &Pseudorange_m[i], sizeof(double));
             d_dump_file.read((char *) &PRN[i], sizeof(double));
+            d_dump_file.read((char *) &valid[i], sizeof(double));
         }
     }
     catch (const std::ifstream::failure &e)
@@ -69,7 +70,7 @@ bool observables_dump_reader::restart()
 long int observables_dump_reader::num_epochs()
 {
     std::ifstream::pos_type size;
-    int number_of_vars_in_epoch = n_channels*6;
+    int number_of_vars_in_epoch = n_channels*7;
     int epoch_size_bytes = sizeof(double) * number_of_vars_in_epoch;
     std::ifstream tmpfile( d_dump_filename.c_str(), std::ios::binary | std::ios::ate);
     if (tmpfile.is_open())
@@ -117,6 +118,7 @@ observables_dump_reader::observables_dump_reader(int n_channels_)
     Acc_carrier_phase_hz=new double[n_channels];
     Pseudorange_m=new double[n_channels];
     PRN=new double[n_channels];
+    valid=new double[n_channels];
 }
 observables_dump_reader::~observables_dump_reader()
 {
@@ -130,4 +132,5 @@ observables_dump_reader::~observables_dump_reader()
     delete[] Acc_carrier_phase_hz;
     delete[] Pseudorange_m;
     delete[] PRN;
+    delete[] valid;
 }
diff --git a/src/tests/unit-tests/signal-processing-blocks/libs/observables_dump_reader.h b/src/tests/unit-tests/signal-processing-blocks/libs/observables_dump_reader.h
index acdffa2f2..205c5cd9b 100644
--- a/src/tests/unit-tests/signal-processing-blocks/libs/observables_dump_reader.h
+++ b/src/tests/unit-tests/signal-processing-blocks/libs/observables_dump_reader.h
@@ -55,6 +55,7 @@ public:
     double* Acc_carrier_phase_hz;
     double* Pseudorange_m;
     double* PRN;
+    double* valid;
 
 private:
     int n_channels;
diff --git a/src/utils/matlab/galileo_e1b_observables_plot_sample.m b/src/utils/matlab/galileo_e1b_observables_plot_sample.m
deleted file mode 100644
index 604be3fe3..000000000
--- a/src/utils/matlab/galileo_e1b_observables_plot_sample.m
+++ /dev/null
@@ -1,22 +0,0 @@
-% Read observables dump
-
-clear all;
-close all;
-
-%IFEN NSR Sampler Fs=20480000
-% GNSS-SDR decimation factor 8
-samplingFreq       = 20480000/8;     %[Hz]
-channels=4;
-path='/home/gnss/workspace/gnss-sdr/trunk/install/';
-observables_log_path=[path 'observables.dat'];
-GNSS_observables= gps_l1_ca_read_observables_dump(channels,observables_log_path);   
-
-
-skip=9000;
-ref_channel=1;
-plot(GNSS_observables.d_TOW_at_current_symbol(ref_channel,skip:end),GNSS_observables.Pseudorange_m(:,skip:end).')
-title('psudoranges');
-figure                   
-plot(GNSS_observables.d_TOW_at_current_symbol(ref_channel,skip:end),GNSS_observables.Prn_timestamp_ms(:,skip:end).')                       
-title('Prn_timestamps');
-  
\ No newline at end of file
diff --git a/src/utils/matlab/gps_l1_ca_observables_plot_sample.m b/src/utils/matlab/gps_l1_ca_observables_plot_sample.m
deleted file mode 100644
index c7a85a60f..000000000
--- a/src/utils/matlab/gps_l1_ca_observables_plot_sample.m
+++ /dev/null
@@ -1,9 +0,0 @@
-% Read observables dump
-
-%clear all;
-
-samplingFreq       = 64e6/16;     %[Hz]
-channels=4;
-path='/home/gnss/workspace/gnss-sdr/trunk/install/';
-observables_log_path=[path 'observables.dat'];
-GNSS_observables= gps_l1_ca_read_observables_dump(channels,observables_log_path);   
diff --git a/src/utils/matlab/hybrid_observables_plot_sample.m b/src/utils/matlab/hybrid_observables_plot_sample.m
new file mode 100644
index 000000000..eb3274b06
--- /dev/null
+++ b/src/utils/matlab/hybrid_observables_plot_sample.m
@@ -0,0 +1,39 @@
+% Read observables dump
+
+%clear all;
+
+samplingFreq       = 2600000;     %[Hz]
+channels=2;
+path='/home/javier/git/gnss-sdr/build/';
+observables_log_path=[path 'observables.dat'];
+GNSS_observables= read_hybrid_observables_dump(channels,observables_log_path);
+
+%optional:
+%search all channels having good satellite simultaneously
+min_idx=1;
+for n=1:1:channels
+    idx=find(GNSS_observables.valid(n,:)>0,1,'first');
+    if min_idx<idx
+        min_idx=idx;
+    end
+end
+
+%plot observables from that index
+figure;
+plot(GNSS_observables.RX_time(1,min_idx+1:end),GNSS_observables.Pseudorange_m(:,min_idx+1:end)');
+title('Pseudoranges [m]')
+xlabel('TOW [s]')
+ylabel('[m]');
+
+figure;
+plot(GNSS_observables.RX_time(1,min_idx+1:end),GNSS_observables.Carrier_phase_hz(:,min_idx+1:end)');
+title('Accumulated carrier phase')
+xlabel('TOW [s]')
+ylabel('[cycles]');
+
+figure;
+plot(GNSS_observables.RX_time(1,min_idx+1:end),GNSS_observables.Carrier_Doppler_hz(:,min_idx+1:end)');
+title('Doppler frequency')
+xlabel('TOW [s]')
+ylabel('[Hz]');
+
diff --git a/src/utils/matlab/libs/gps_l1_ca_dll_pll_read_observables_dump.m b/src/utils/matlab/libs/gps_l1_ca_dll_pll_read_observables_dump.m
deleted file mode 100644
index a5bc2adcc..000000000
--- a/src/utils/matlab/libs/gps_l1_ca_dll_pll_read_observables_dump.m
+++ /dev/null
@@ -1,60 +0,0 @@
-% Javier Arribas 2011             
-function [observables] = gps_l1_ca_dll_pll_read_observables_dump (channels, filename, count)
-
-  %% usage: read_tracking_dat (filename, [count])
-  %%
-  %% open GNSS-SDR tracking binary log file .dat and return the contents
-  %%
-
-  m = nargchk (1,2,nargin);
-  num_double_vars=5;
-  double_size_bytes=8;
-  skip_bytes_each_read=double_size_bytes*num_double_vars*channels;
-  bytes_shift=0;
-  if (m)
-    usage (m);
-  end
-
-  if (nargin < 3)
-    count = Inf;
-  end
-    %loops_counter = fread (f, count, 'uint32',4*12);
-  f = fopen (filename, 'rb');
-  if (f < 0)
-  else
-    for N=1:1:channels
-        observables.preamble_delay_ms(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
-        bytes_shift=bytes_shift+double_size_bytes;
-        fseek(f,bytes_shift,'bof'); % move to next interleaved
-        observables.prn_delay_ms(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
-        bytes_shift=bytes_shift+double_size_bytes;
-        fseek(f,bytes_shift,'bof'); % move to next interleaved
-        observables.Pseudorange_m(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
-        bytes_shift=bytes_shift+double_size_bytes;
-        fseek(f,bytes_shift,'bof'); % move to next interleaved
-        observables.Pseudorange_symbol_shift(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
-        bytes_shift=bytes_shift+double_size_bytes;
-        fseek(f,bytes_shift,'bof'); % move to next interleaved
-        observables.PRN(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
-        bytes_shift=bytes_shift+double_size_bytes;
-        fseek(f,bytes_shift,'bof'); % move to next interleaved
-    end
-
-    fclose (f);
-    
-    %%%%%%%% output vars %%%%%%%%
-%     for (unsigned int i=0; i<d_nchannels ; i++)
-%         {
-%             tmp_double = current_gnss_synchro[i].Preamble_delay_ms;
-%             d_dump_file.write((char*)&tmp_double, sizeof(double));
-%             tmp_double = current_gnss_synchro[i].Prn_delay_ms;
-%             d_dump_file.write((char*)&tmp_double, sizeof(double));
-%             tmp_double = current_gnss_synchro[i].Pseudorange_m;
-%             d_dump_file.write((char*)&tmp_double, sizeof(double));
-%             tmp_double = current_gnss_synchro[i].Pseudorange_symbol_shift;
-%             d_dump_file.write((char*)&tmp_double, sizeof(double));
-%             tmp_double = current_gnss_synchro[i].PRN;
-%             d_dump_file.write((char*)&tmp_double, sizeof(double));
-%         }
-  end
-  
diff --git a/src/utils/matlab/libs/gps_l1_ca_read_observables_dump.m b/src/utils/matlab/libs/read_hybrid_observables_dump.m
similarity index 61%
rename from src/utils/matlab/libs/gps_l1_ca_read_observables_dump.m
rename to src/utils/matlab/libs/read_hybrid_observables_dump.m
index 32c3c1eba..b14090a2a 100644
--- a/src/utils/matlab/libs/gps_l1_ca_read_observables_dump.m
+++ b/src/utils/matlab/libs/read_hybrid_observables_dump.m
@@ -1,5 +1,5 @@
 % Javier Arribas 2011             
-function [observables] = gps_l1_ca_read_observables_dump (channels, filename, count)
+function [observables] = read_hybrid_observables_dump (channels, filename, count)
 
   %% usage: read_tracking_dat (filename, [count])
   %%
@@ -7,7 +7,7 @@ function [observables] = gps_l1_ca_read_observables_dump (channels, filename, co
   %%
 
   m = nargchk (1,2,nargin);
-  num_double_vars=5;
+  num_double_vars=7;
   double_size_bytes=8;
   skip_bytes_each_read=double_size_bytes*num_double_vars*channels;
   bytes_shift=0;
@@ -23,19 +23,25 @@ function [observables] = gps_l1_ca_read_observables_dump (channels, filename, co
   if (f < 0)
   else
     for N=1:1:channels
+        observables.RX_time(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
+        bytes_shift=bytes_shift+double_size_bytes;
+        fseek(f,bytes_shift,'bof'); % move to next interleaved
         observables.d_TOW_at_current_symbol(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
         bytes_shift=bytes_shift+double_size_bytes;
         fseek(f,bytes_shift,'bof'); % move to next interleaved
-        observables.Prn_timestamp_ms(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
+        observables.Carrier_Doppler_hz(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
+        bytes_shift=bytes_shift+double_size_bytes;
+        fseek(f,bytes_shift,'bof'); % move to next interleaved
+        observables.Carrier_phase_hz(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
         bytes_shift=bytes_shift+double_size_bytes;
         fseek(f,bytes_shift,'bof'); % move to next interleaved
         observables.Pseudorange_m(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
         bytes_shift=bytes_shift+double_size_bytes;
         fseek(f,bytes_shift,'bof'); % move to next interleaved
-        observables.Flag_valid_pseudorange(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
+        observables.PRN(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
         bytes_shift=bytes_shift+double_size_bytes;
         fseek(f,bytes_shift,'bof'); % move to next interleaved
-        observables.PRN(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
+        observables.valid(N,:) = fread (f, count, 'float64',skip_bytes_each_read-double_size_bytes);
         bytes_shift=bytes_shift+double_size_bytes;
         fseek(f,bytes_shift,'bof'); % move to next interleaved
     end
@@ -44,18 +50,22 @@ function [observables] = gps_l1_ca_read_observables_dump (channels, filename, co
     
     %%%%%%%% output vars %%%%%%%%
 %     double tmp_double;
-%     for (unsigned int i=0; i<d_nchannels ; i++)
+%     for (unsigned int i = 0; i < d_nchannels; i++)
 %         {
-%             tmp_double = current_gnss_synchro[i].d_TOW_at_current_symbol;
+%             tmp_double = current_gnss_synchro[i].RX_time;
 %             d_dump_file.write((char*)&tmp_double, sizeof(double));
-%             tmp_double = current_gnss_synchro[i].Prn_timestamp_ms;
+%             tmp_double = current_gnss_synchro[i].TOW_at_current_symbol_s;
+%             d_dump_file.write((char*)&tmp_double, sizeof(double));
+%             tmp_double = current_gnss_synchro[i].Carrier_Doppler_hz;
+%             d_dump_file.write((char*)&tmp_double, sizeof(double));
+%             tmp_double = current_gnss_synchro[i].Carrier_phase_rads/GPS_TWO_PI;
 %             d_dump_file.write((char*)&tmp_double, sizeof(double));
 %             tmp_double = current_gnss_synchro[i].Pseudorange_m;
 %             d_dump_file.write((char*)&tmp_double, sizeof(double));
-%             tmp_double = (double)(current_gnss_synchro[i].Flag_valid_pseudorange==true);
-%             d_dump_file.write((char*)&tmp_double, sizeof(double));
 %             tmp_double = current_gnss_synchro[i].PRN;
 %             d_dump_file.write((char*)&tmp_double, sizeof(double));
-%             }
+%             tmp_double = current_gnss_synchro[i].Flag_valid_pseudorange;
+%             d_dump_file.write((char*)&tmp_double, sizeof(double));
+%         }
   end