diff --git a/src/blah2.cpp b/src/blah2.cpp
index 2af675a..0e7f34d 100644
--- a/src/blah2.cpp
+++ b/src/blah2.cpp
@@ -15,6 +15,7 @@
 #include "process/detection/Interpolate.h"
 #include "process/spectrum/SpectrumAnalyser.h"
 #include "process/tracker/Tracker.h"
+#include "data/meta/Constants.h"
 
 #include <ryml/ryml.hpp>
 #include <ryml/ryml_std.hpp> // optional header, provided for std:: interop
@@ -193,8 +194,8 @@ int main(int argc, char **argv)
   tree["process"]["tracker"]["initiate"]["N"] >> n;
   tree["process"]["tracker"]["delete"] >> nDelete;
   tree["process"]["tracker"]["initiate"]["maxAcc"] >> maxAcc;
-  rangeRes = 299792458.0/fs;
-  lambda = 299792458.0/fc;
+  rangeRes = (double)Constants::c/fs;
+  lambda = (double)Constants::c/fc;
   Tracker *tracker = new Tracker(m, n, nDelete, ambiguity->cpi_length_seconds(), maxAcc, rangeRes, lambda);
 
   // setup process spectrum analyser
diff --git a/src/data/Detection.cpp b/src/data/Detection.cpp
index d49a751..ff33b16 100644
--- a/src/data/Detection.cpp
+++ b/src/data/Detection.cpp
@@ -1,4 +1,5 @@
 #include "Detection.h"
+#include "data/meta/Constants.h"
 #include <iostream>
 #include <cstdlib>
 #include <chrono>
@@ -93,7 +94,7 @@ std::string Detection::delay_bin_to_km(std::string json, uint32_t fs)
   document["delay"].Clear();
   for (int i = 0; i < delay.size(); i++)
   {
-    document["delay"].PushBack(1.0*delay[i]*(299792458/(double)fs)/1000, allocator);
+    document["delay"].PushBack(1.0*delay[i]*(Constants::c/(double)fs)/1000, allocator);
   }
 
   rapidjson::StringBuffer strbuf;
diff --git a/src/data/Map.cpp b/src/data/Map.cpp
index 0c9ddfe..9ec3290 100644
--- a/src/data/Map.cpp
+++ b/src/data/Map.cpp
@@ -1,4 +1,5 @@
 #include "Map.h"
+#include "data/meta/Constants.h"
 #include <iostream>
 #include <cstdlib>
 #include <chrono>
@@ -172,7 +173,7 @@ std::string Map<T>::delay_bin_to_km(std::string json, uint32_t fs)
   document["delay"].Clear();
   for (int i = 0; i < delay.size(); i++)
   {
-    document["delay"].PushBack(1.0*delay[i]*(299792458/(double)fs)/1000, allocator);
+    document["delay"].PushBack(1.0*delay[i]*(Constants::c/(double)fs)/1000, allocator);
   }
 
   rapidjson::StringBuffer strbuf;
diff --git a/src/data/meta/Constants.h b/src/data/meta/Constants.h
new file mode 100644
index 0000000..8a736dd
--- /dev/null
+++ b/src/data/meta/Constants.h
@@ -0,0 +1,11 @@
+#ifndef CONSTANTS_H
+#define CONSTANTS_H
+
+#include <stdint.h>
+
+namespace Constants
+{
+  const uint32_t c = 299792458;
+}
+
+#endif
\ No newline at end of file
diff --git a/test/unit/process/tracker/TestTracker.cpp b/test/unit/process/tracker/TestTracker.cpp
index f0e86bf..13c27d9 100644
--- a/test/unit/process/tracker/TestTracker.cpp
+++ b/test/unit/process/tracker/TestTracker.cpp
@@ -8,6 +8,7 @@
 #include "data/Detection.h"
 #include "data/Track.h"
 #include "process/tracker/Tracker.h"
+#include "data/meta/Constants.h"
 
 #include <string>
 #include <vector>
@@ -24,9 +25,9 @@ TEST_CASE("Constructor", "[constructor]")
   double cpi = 1;
   double maxAccInit = 10;
   double fs = 2000000;
-  double rangeRes = 299792458.0/fs;
+  double rangeRes = (double)Constants::c/fs;
   double fc = 204640000;
-  double lambda = 299792458.0/fc;
+  double lambda = (double)Constants::c/fc;
   Tracker tracker = Tracker(m, n, nDelete, 
     cpi, maxAccInit, rangeRes, lambda);
 }
@@ -40,9 +41,9 @@ TEST_CASE("Process ACTIVE track constant acc", "[process]")
   double cpi = 1;
   double maxAccInit = 10;
   double fs = 2000000;
-  double rangeRes = 299792458.0/fs;
+  double rangeRes = (double)Constants::c/fs;
   double fc = 204640000;
-  double lambda = 299792458.0/fc;
+  double lambda = (double)Constants::c/fc;
   Tracker tracker = Tracker(m, n, nDelete, 
     cpi, maxAccInit, rangeRes, lambda);
   
@@ -64,9 +65,9 @@ TEST_CASE("Test predict", "[predict]")
   double cpi = 1;
   double maxAccInit = 10;
   double fs = 2000000;
-  double rangeRes = 299792458.0/fs;
+  double rangeRes = (double)Constants::c/fs;
   double fc = 204640000;
-  double lambda = 299792458.0/fc;
+  double lambda = (double)Constants::c/fc;
   Tracker tracker = Tracker(m, n, nDelete, 
     cpi, maxAccInit, rangeRes, lambda);