diff --git a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.h b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.h
index 9a6d99143..a7f1af3dd 100644
--- a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.h
+++ b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.h
@@ -90,7 +90,7 @@ private:
     std::ofstream d_dump_file;
 
     std::ofstream subframe_data_file;
-    std::string subframe_file_prefix = "/mnt/c/Documents and Settings/Admin/gnss-sdr/data_treatment/subframes/subframe_";
+    std::string subframe_file_prefix = "./RawNavMessagesChannel-";
 
     boost::circular_buffer<float> d_symbol_history;
 
diff --git a/src/core/system_parameters/gps_navigation_message.cc b/src/core/system_parameters/gps_navigation_message.cc
index fc65aaadb..6ca8c6f7b 100644
--- a/src/core/system_parameters/gps_navigation_message.cc
+++ b/src/core/system_parameters/gps_navigation_message.cc
@@ -101,9 +101,9 @@ int32_t Gps_Navigation_Message::subframe_decoder(const char* subframe, std::ofst
 
     if(subframe_writer!=nullptr)
     {        
-        *subframe_writer << "*" << subframe_ID << "*";
-        *subframe_writer << subframe_bits << "\n"; 
-    }    
+        *subframe_writer << subframe_ID << ",";
+        *subframe_writer << subframe_bits << "\n";
+    }
 
     // Decode all 5 sub-frames
     switch (subframe_ID)