diff --git a/gps/GPS.cc b/gps/GPS.cc
index 3d14fc7..6264d1d 100644
--- a/gps/GPS.cc
+++ b/gps/GPS.cc
@@ -228,7 +228,18 @@ void GPS::parse_GGA(const string& frame)
 	while(getline(ss, data, ',')) s_data.push_back(data);
 
 	// Is the data valid?
-	this->active = s_data[6] > "0";
+	bool active = s_data[6] > "0";
+    
+	if (this->active && ! active)
+	{
+		this->logger->log("Fix lost.");
+		this->active = false;
+	}
+	else if ( ! this->active && active)
+	{
+		this->logger->log("Fix acquired.");
+		this->active = true;
+	}
 
 	if (this->active)
 	{
@@ -264,7 +275,18 @@ void GPS::parse_GSA(const string& frame)
 	while(getline(ss, data, ',')) s_data.push_back(data);
 
 	// Is the data valid?
-	this->active = s_data[2] != "1";
+	bool active = s_data[2] != "1";
+    
+	if (this->active && ! active)
+	{
+		this->logger->log("Fix lost.");
+		this->active = false;
+	}
+	else if ( ! this->active && active)
+	{
+		this->logger->log("Fix acquired.");
+		this->active = true;
+	}
 
 	if (this->active)
 	{
@@ -285,7 +307,18 @@ void GPS::parse_RMC(const string& frame)
 	while(getline(ss, data, ',')) s_data.push_back(data);
 
 	// Is the data valid?
-	this->active = s_data[2] == "A";
+	bool active = s_data[2] == "A";
+
+	if (this->active && ! active)
+	{
+		this->logger->log("Fix lost.");
+		this->active = false;
+	}
+	else if ( ! this->active && active)
+	{
+		this->logger->log("Fix acquired");
+		this->active = true;
+	}
 
 	if (this->active)
 	{