diff --git a/src/algorithms/PVT/gnuradio_blocks/rtklib_pvt_cc.cc b/src/algorithms/PVT/gnuradio_blocks/rtklib_pvt_cc.cc
index 85290da73..1554884b0 100644
--- a/src/algorithms/PVT/gnuradio_blocks/rtklib_pvt_cc.cc
+++ b/src/algorithms/PVT/gnuradio_blocks/rtklib_pvt_cc.cc
@@ -1713,9 +1713,11 @@ int rtklib_pvt_cc::work (int noutput_items, gr_vector_const_void_star &input_ite
                     // DEBUG MESSAGE: Display position in console output
                     if( (d_ls_pvt->is_valid_position() == true) && (flag_display_pvt == true) )
                         {
-                            std::cout << "Position at " << boost::posix_time::to_simple_string(d_ls_pvt->get_position_UTC_time())
+                            std::string text_green = "\033[32m";
+                            std::string text_reset = "\033[0m";
+                            std::cout << text_green << "Position at " << boost::posix_time::to_simple_string(d_ls_pvt->get_position_UTC_time())
                                       << " UTC using " << d_ls_pvt->get_num_valid_observations() << " observations is Lat = " << d_ls_pvt->get_latitude() << " [deg], Long = " << d_ls_pvt->get_longitude()
-                                      << " [deg], Height= " << d_ls_pvt->get_height() << " [m]" << std::endl;
+                                      << " [deg], Height= " << d_ls_pvt->get_height() << " [m]" << text_reset << std::endl;
 
                             LOG(INFO) << "Position at " << boost::posix_time::to_simple_string(d_ls_pvt->get_position_UTC_time())
                                       << " UTC using "<< d_ls_pvt->get_num_valid_observations() << " observations is Lat = " << d_ls_pvt->get_latitude() << " [deg], Long = " << d_ls_pvt->get_longitude()
diff --git a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
index ecee876d9..105e1fc38 100644
--- a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
+++ b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
@@ -63,7 +63,7 @@ hybrid_observables_cc::hybrid_observables_cc(unsigned int nchannels_in, unsigned
     d_dump_filename_in = d_dump_filename;
     T_rx_s = 0.0;
     T_rx_step_s = 0.001; // 1 ms
-    max_delta = 0.1; // 100 ms
+    max_delta = 0.15; // 150 ms
     valid_channels.resize(d_nchannels, false);
     d_num_valid_channels = 0;
 
@@ -399,7 +399,6 @@ std::pair<Gnss_Synchro, Gnss_Synchro> hybrid_observables_cc::find_closest(std::d
         invalid_data.Flag_valid_pseudorange = false;
         result.first  = invalid_data;
         result.second = invalid_data;
-        std::cout << text_red << data.at(index).Signal << text_reset << std::endl;
     }
     else if(delta_t < 0.0)
     {
@@ -407,7 +406,6 @@ std::pair<Gnss_Synchro, Gnss_Synchro> hybrid_observables_cc::find_closest(std::d
         result.first.Flag_valid_pseudorange = true;
         result.second = data.at(index - 1);
         result.second.Flag_valid_pseudorange = true;
-        std::cout << text_green << data.at(index).Signal << text_reset << std::endl;
     }
     else
     {
@@ -415,7 +413,6 @@ std::pair<Gnss_Synchro, Gnss_Synchro> hybrid_observables_cc::find_closest(std::d
         result.first.Flag_valid_pseudorange = true;
         result.second = data.at(index);
         result.second.Flag_valid_pseudorange = true;
-        std::cout << text_green << data.at(index).Signal << text_reset << std::endl;
     }
     return result;
 }
diff --git a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.h b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.h
index b562a7232..5f9d0722f 100644
--- a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.h
+++ b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.h
@@ -85,11 +85,6 @@ private:
     std::ofstream d_dump_file;
     std::ofstream d_dump_in;
 
-    std::string text_red   = "\033[31m";
-    std::string text_green = "\033[32m";
-    std::string text_reset = "\033[0m";
-
-
     int save_matfile();
 };
 
diff --git a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l2c_telemetry_decoder_cc.cc b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l2c_telemetry_decoder_cc.cc
index e5f37423a..20be2dcf9 100644
--- a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l2c_telemetry_decoder_cc.cc
+++ b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l2c_telemetry_decoder_cc.cc
@@ -156,8 +156,18 @@ int gps_l2c_telemetry_decoder_cc::general_work (int noutput_items __attribute__(
             //* delay by the formulae:
             //* \code
             //* symbolTime_ms = msg->tow * 6000 + *pdelay * 20 + (12 * 20); 12 symbols of the encoder's transitory
+            double tmp_tow= d_TOW_at_current_symbol += GPS_L2_M_PERIOD;
             d_TOW_at_current_symbol = static_cast<double>(msg.tow) * 6.0 + static_cast<double>(delay) * GPS_L2_M_PERIOD + 12 * GPS_L2_M_PERIOD;
             d_TOW_at_current_symbol = floor(d_TOW_at_current_symbol * 1000.0) / 1000.0;
+            double tmp_diff = std::fabs(tmp_tow-d_TOW_at_current_symbol);
+            if ((tmp_tow != 0) or (tmp_diff > 0.0))
+            {
+                std::string text_red = "\033[31m";
+                std::string text_reset = "\033[0m";
+                std::cout << text_red <<
+                        "GPS L2C. TOW incoherence on channel: "<< d_channel << ". TOW difference = " <<
+                        tmp_diff * 1000.0 << " [ms]" << text_reset << std::endl;
+            }
             d_flag_valid_word = true;
         }
     else