diff --git a/core/SystemStatus.cpp b/core/SystemStatus.cpp
index a7f282df..3310b8bb 100644
--- a/core/SystemStatus.cpp
+++ b/core/SystemStatus.cpp
@@ -34,6 +34,7 @@
 #include <sys/time.h>
 #include <pthread.h>
 #include <platform_lib_log_util.h>
+#include <loc_nmea.h>
 #include <SystemStatus.h>
 
 namespace loc_core
@@ -48,14 +49,10 @@ protected:
     std::vector<std::string> mField;
     timespec setUtcTime(std::string sutctime);
 
-public:
-    static const uint32_t NMEA_MINSIZE = 6;
-    static const uint32_t NMEA_MAXSIZE = 256;
-
     SystemStatusNmeaBase(const char *str_in, uint32_t len_in)
     {
         // check size and talker
-        if (len_in > NMEA_MAXSIZE || len_in < NMEA_MINSIZE || (str_in[0] != '$')) {
+        if (!loc_nmea_is_debug(str_in, len_in)) {
             return;
         }
 
@@ -83,6 +80,10 @@ public:
     }
 
     virtual ~SystemStatusNmeaBase() { }
+
+public:
+    static const uint32_t NMEA_MINSIZE = DEBUG_NMEA_MINSIZE;
+    static const uint32_t NMEA_MAXSIZE = DEBUG_NMEA_MAXSIZE;
 };
 
 timespec SystemStatusNmeaBase::setUtcTime(std::string sutctime)
@@ -1316,9 +1317,7 @@ static uint32_t cnt_s1 = 0;
 bool SystemStatus::setNmeaString(const char *data, uint32_t len)
 {
     bool ret = false;
-    if (NULL == data
-        || (len < SystemStatusNmeaBase::NMEA_MINSIZE)
-        || (len > SystemStatusNmeaBase::NMEA_MAXSIZE)) {
+    if (!loc_nmea_is_debug(data, len)) {
         return false;
     }
 
diff --git a/gnss/GnssAdapter.cpp b/gnss/GnssAdapter.cpp
index 1c195c2c..377a0781 100644
--- a/gnss/GnssAdapter.cpp
+++ b/gnss/GnssAdapter.cpp
@@ -39,6 +39,7 @@
 #include <GnssAdapter.h>
 #include <string>
 #include <loc_log.h>
+#include <loc_nmea.h>
 #include <Agps.h>
 #include <SystemStatus.h>
 
@@ -1987,9 +1988,8 @@ GnssAdapter::reportSv(GnssSvNotification& svNotify)
 void
 GnssAdapter::reportNmeaEvent(const char* nmea, size_t length, bool fromUlp)
 {
-
     // if this event is not called from ULP, then try to call into ULP and return if successfull
-    if (!fromUlp) {
+    if (!fromUlp && !loc_nmea_is_debug(nmea, length)) {
         if (mUlpProxy->reportNmea(nmea, length)) {
             return;
         }
diff --git a/utils/loc_nmea.h b/utils/loc_nmea.h
index 92f997ea..d182e419 100644
--- a/utils/loc_nmea.h
+++ b/utils/loc_nmea.h
@@ -43,4 +43,12 @@ void loc_nmea_generate_pos(const UlpLocation &location,
                                unsigned char generate_nmea,
                                std::vector<std::string> &nmeaArraystr);
 
+#define DEBUG_NMEA_MINSIZE 6
+#define DEBUG_NMEA_MAXSIZE 256
+inline bool loc_nmea_is_debug(const char* nmea, int length) {
+    return ((nullptr != nmea) &&
+            (length >= DEBUG_NMEA_MINSIZE) && (length <= DEBUG_NMEA_MAXSIZE) &&
+            (nmea[0] == '$') && (nmea[1] == 'P') && (nmea[2] == 'Q') && (nmea[3] == 'W'));
+}
+
 #endif // LOC_ENG_NMEA_H