diff --git a/utils/makefile b/utils/makefile
index 28dfe44..b49757d 100644
--- a/utils/makefile
+++ b/utils/makefile
@@ -4,6 +4,9 @@ read_log:	read_log.cc
 aprs2igc:	aprs2igc.cc
 	g++ -Wall -Wno-misleading-indentation -O2 -o aprs2igc aprs2igc.cc format.cpp
 
-clean:
-	rm read_log aprs2igc
+serial_dump:	serial_dump.cc
+	g++ -Wall -Wno-misleading-indentation -O2 -o serial_dump serial_dump.cc format.cpp
+
+clean:
+	rm read_log aprs2igc serial_dump
 
diff --git a/utils/serial_dump.cc b/utils/serial_dump.cc
new file mode 100644
index 0000000..a15b470
--- /dev/null
+++ b/utils/serial_dump.cc
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <time.h>
+#include <string.h>
+#include <math.h>
+
+#include "serial.h"
+#include "ogn.h"
+
+static double getTime(void)                                           // read the system time at this very moment
+{ struct timespec now; clock_gettime(CLOCK_REALTIME, &now); return now.tv_sec + 1e-9*now.tv_nsec; }
+
+SerialPort Port;
+
+int main(int argc, char *argv[])
+{ const int MaxLineLen = 256;
+  char Line[MaxLineLen];
+  int LineIdx;
+
+  const char *PortName = "/dev/ttyUSB0";                              // default serial port name
+        int   BaudRate = 115200;                                      // default baud rate on the serial port
+
+  if(argc>=2)
+  { char *Colon = strchr(argv[1],':');
+    if(Colon) { Colon[0]=0; BaudRate=atoi(Colon+1); }
+    PortName = argv[1]; }
+
+  if(Port.Open(PortName, BaudRate)<0) { printf("Can't open %s at %dbps\n", PortName, BaudRate); return -1; }
+
+  uint8_t Index[20];
+  LineIdx=0;                                                          // line byte index/counter
+  double Start=getTime();                                             // line start time
+  for( ; ; )
+  { char Byte;
+    if(Port.Read(Byte)<=0) { usleep(1000); continue; }                // if no new bytes on the serial port sleep a little
+    if(LineIdx==0) Start=getTime();                                   // if this is the first byte on the line: note the time
+    if(Byte<' ')                                                      // if a control (non-printable) character
+    { if(LineIdx==0) { printf("<%02X>", Byte); continue; }                                    // if this is the first byte on the line
+      printf("\n");
+      Line[LineIdx]=0;                                                // if more bytes on this line: add NL at the end of the line
+      int8_t Err=GPS_Position::IndexNMEA(Index, Line);
+      uint32_t Time=(uint32_t)floor(Start);
+      double Frac=Start-Time;
+      printf("%06.3f [%3d] [%2d] %s<%02X>", (Time%60)+Frac, LineIdx, Err, Line, Byte);     // print the time, line length and the line itself
+      LineIdx=0;                                                      // reset line byte index/counter
+      continue; }
+    if(LineIdx<MaxLineLen) Line[LineIdx++]=Byte;
+  }
+
+  Port.Close();
+  return 0; }