diff --git a/libraries/AP_GPS/AP_GPS_ERB.cpp b/libraries/AP_GPS/AP_GPS_ERB.cpp
index b125154d10..3326ac6040 100644
--- a/libraries/AP_GPS/AP_GPS_ERB.cpp
+++ b/libraries/AP_GPS/AP_GPS_ERB.cpp
@@ -57,6 +57,9 @@ AP_GPS_ERB::read(void)
 
         // read the next byte
         data = port->read();
+#if AP_GPS_DEBUG_LOGGING_ENABLED
+        log_data(&data, 1);
+#endif
 
         reset:
         switch(_step) {
diff --git a/libraries/AP_GPS/AP_GPS_GSOF.cpp b/libraries/AP_GPS/AP_GPS_GSOF.cpp
index bb420b1f59..453e932c2c 100644
--- a/libraries/AP_GPS/AP_GPS_GSOF.cpp
+++ b/libraries/AP_GPS/AP_GPS_GSOF.cpp
@@ -76,6 +76,9 @@ AP_GPS_GSOF::read(void)
     bool ret = false;
     while (port->available() > 0) {
         uint8_t temp = port->read();
+#if AP_GPS_DEBUG_LOGGING_ENABLED
+        log_data(&temp, 1);
+#endif
         ret |= parse(temp);
     }
 
diff --git a/libraries/AP_GPS/AP_GPS_NMEA.cpp b/libraries/AP_GPS/AP_GPS_NMEA.cpp
index 826613747c..9c467a5dfe 100644
--- a/libraries/AP_GPS/AP_GPS_NMEA.cpp
+++ b/libraries/AP_GPS/AP_GPS_NMEA.cpp
@@ -54,12 +54,12 @@ bool AP_GPS_NMEA::read(void)
     numc = port->available();
     while (numc--) {
         char c = port->read();
-        if (_decode(c)) {
-            parsed = true;
-        }
 #if AP_GPS_DEBUG_LOGGING_ENABLED
         log_data((const uint8_t *)&c, 1);
 #endif
+        if (_decode(c)) {
+            parsed = true;
+        }
     }
     return parsed;
 }
diff --git a/libraries/AP_GPS/AP_GPS_NOVA.cpp b/libraries/AP_GPS/AP_GPS_NOVA.cpp
index b70c15af21..dc6246c577 100644
--- a/libraries/AP_GPS/AP_GPS_NOVA.cpp
+++ b/libraries/AP_GPS/AP_GPS_NOVA.cpp
@@ -90,6 +90,9 @@ AP_GPS_NOVA::read(void)
     bool ret = false;
     while (port->available() > 0) {
         uint8_t temp = port->read();
+#if AP_GPS_DEBUG_LOGGING_ENABLED
+        log_data(&temp, 1);
+#endif
         ret |= parse(temp);
     }
     
diff --git a/libraries/AP_GPS/AP_GPS_SBF.cpp b/libraries/AP_GPS/AP_GPS_SBF.cpp
index 5abd60b288..334e847a69 100644
--- a/libraries/AP_GPS/AP_GPS_SBF.cpp
+++ b/libraries/AP_GPS/AP_GPS_SBF.cpp
@@ -86,6 +86,9 @@ AP_GPS_SBF::read(void)
     uint32_t available_bytes = port->available();
     for (uint32_t i = 0; i < available_bytes; i++) {
         uint8_t temp = port->read();
+#if AP_GPS_DEBUG_LOGGING_ENABLED
+        log_data(&temp, 1);
+#endif
         ret |= parse(temp);
     }
 
diff --git a/libraries/AP_GPS/AP_GPS_SBP.cpp b/libraries/AP_GPS/AP_GPS_SBP.cpp
index 3bd80af802..94eea80116 100644
--- a/libraries/AP_GPS/AP_GPS_SBP.cpp
+++ b/libraries/AP_GPS/AP_GPS_SBP.cpp
@@ -100,6 +100,9 @@ AP_GPS_SBP::_sbp_process()
 
     while (port->available() > 0) {
         uint8_t temp = port->read();
+#if AP_GPS_DEBUG_LOGGING_ENABLED
+        log_data(&temp, 1);
+#endif
         uint16_t crc;
 
 
diff --git a/libraries/AP_GPS/AP_GPS_SBP2.cpp b/libraries/AP_GPS/AP_GPS_SBP2.cpp
index b2bf4f4ca7..8638e671eb 100644
--- a/libraries/AP_GPS/AP_GPS_SBP2.cpp
+++ b/libraries/AP_GPS/AP_GPS_SBP2.cpp
@@ -103,6 +103,9 @@ AP_GPS_SBP2::_sbp_process()
     while (nleft > 0) {
         nleft--;
         uint8_t temp = port->read();
+#if AP_GPS_DEBUG_LOGGING_ENABLED
+        log_data(&temp, 1);
+#endif
         uint16_t crc;
 
         //This switch reads one character at a time,