diff --git a/src/station_utils.cpp b/src/station_utils.cpp
new file mode 100644
index 0000000..c2e43fc
--- /dev/null
+++ b/src/station_utils.cpp
@@ -0,0 +1,30 @@
+#include "station_utils.h"
+/*#include <WiFi.h>
+#include "configuration.h"
+#include "display.h"
+
+extern Configuration  Config;
+extern WiFiClient     espClient;
+extern int            internalLedPin;
+extern uint32_t       lastRxTxTime;*/
+
+namespace APRS_IS_Utils {
+
+
+void deleteNotHeardStation() {
+  uint32_t minReportingTime = 30*60*1000; // 30 minutes // from .json and CONFIGURATION?????
+  for (int i=0; i<lastHeardStation.size(); i++) {
+    String deltaTimeString = lastHeardStation[i].substring(lastHeardStation[i].indexOf(",")+1);
+    uint32_t deltaTime = deltaTimeString.toInt();
+    if ((millis() - deltaTime) < minReportingTime) {
+      lastHeardStation_temp.push_back(lastHeardStation[i]);
+    }
+  }
+  lastHeardStation.clear();
+  for (int j=0; j<lastHeardStation_temp.size(); j++) {
+    lastHeardStation.push_back(lastHeardStation_temp[j]);
+  }
+  lastHeardStation_temp.clear();
+}
+
+}
\ No newline at end of file
diff --git a/src/station_utils.h b/src/station_utils.h
new file mode 100644
index 0000000..bd9dbbf
--- /dev/null
+++ b/src/station_utils.h
@@ -0,0 +1,12 @@
+#ifndef STATION_UTILS_H_
+#define STATION_UTILS_H_
+
+#include <Arduino.h>
+
+namespace STATION_Utils {
+
+void deleteNotHeardStation();
+
+}
+
+#endif
\ No newline at end of file