diff --git a/libraries/AP_GPS/AP_GPS_SBF.cpp b/libraries/AP_GPS/AP_GPS_SBF.cpp
index 72155b9cab..8479a7fcdb 100644
--- a/libraries/AP_GPS/AP_GPS_SBF.cpp
+++ b/libraries/AP_GPS/AP_GPS_SBF.cpp
@@ -53,16 +53,21 @@ AP_GPS_SBF::AP_GPS_SBF(AP_GPS &_gps, AP_GPS::GPS_State &_state,
 bool
 AP_GPS_SBF::read(void)
 {
-	uint32_t now = AP_HAL::millis();
-	
-	if (_init_blob_index < (sizeof(_initialisation_blob) / sizeof(_initialisation_blob[0]))) {
-		if (now > _init_blob_time) {
-			port->write((const uint8_t*)_initialisation_blob[_init_blob_index], strlen(_initialisation_blob[_init_blob_index]));
-			_init_blob_time = now + 70;
-			_init_blob_index++;
-		}
-	}
-	
+    uint32_t now = AP_HAL::millis();
+
+    if (_init_blob_index < (sizeof(_initialisation_blob) / sizeof(_initialisation_blob[0]))) {
+        if (validcommand) {
+            _init_blob_index++;
+            validcommand = false;
+            _init_blob_time = 0;
+        }
+
+        if (now > _init_blob_time) {
+            port->write((const uint8_t*)_initialisation_blob[_init_blob_index], strlen(_initialisation_blob[_init_blob_index]));
+            _init_blob_time = now + 1000;
+        }
+    }
+
     bool ret = false;
     while (port->available() > 0) {
         uint8_t temp = port->read();
@@ -82,11 +87,17 @@ AP_GPS_SBF::parse(uint8_t temp)
             if (temp == SBF_PREAMBLE1) {
                 sbf_msg.sbf_state = sbf_msg_parser_t::PREAMBLE2;
                 sbf_msg.read = 0;
+            } else if (temp == '$') {
+                // this is a command response
+                sbf_msg.sbf_state = sbf_msg_parser_t::PREAMBLE2;
             }
             break;
         case sbf_msg_parser_t::PREAMBLE2:
             if (temp == SBF_PREAMBLE2) {
                 sbf_msg.sbf_state = sbf_msg_parser_t::CRC1;
+            } else if (temp == 'R') {
+                validcommand = true;
+                sbf_msg.sbf_state = sbf_msg_parser_t::PREAMBLE1;
             }
             else
             {
diff --git a/libraries/AP_GPS/AP_GPS_SBF.h b/libraries/AP_GPS/AP_GPS_SBF.h
index 32463d7aaf..8a30759edb 100644
--- a/libraries/AP_GPS/AP_GPS_SBF.h
+++ b/libraries/AP_GPS/AP_GPS_SBF.h
@@ -45,18 +45,20 @@ private:
 
     static const uint8_t SBF_PREAMBLE1 = '$';
     static const uint8_t SBF_PREAMBLE2 = '@';
-	
-	uint8_t _init_blob_index = 0;
-	uint32_t _init_blob_time = 0;
-	const char* _initialisation_blob[4] = {
-	"sso, Stream1, COM1, PVTGeodetic+DOP+ExtEventPVTGeodetic, msec100\n",
-	"srd, Moderate, UAV\n",
-	"sem, PVT, 5\n",
-	"spm, Rover, StandAlone+DGPS+RTK\n"};
+
+    uint8_t _init_blob_index = 0;
+    uint32_t _init_blob_time = 0;
+    const char* _initialisation_blob[5] = {
+    "sso, Stream1, COM1, PVTGeodetic+DOP+ExtEventPVTGeodetic, msec100\n",
+    "srd, Moderate, UAV\n",
+    "sem, PVT, 5\n",
+    "spm, Rover, StandAlone+SBAS+DGPS+RTK\n",
+    "sso, Stream2, Dsk1, Rinex+Event+RawData, msec100\n"};
    
     uint32_t last_hdop = 999;
     uint32_t crc_error_counter = 0;
-	uint32_t last_injected_data_ms = 0;
+    uint32_t last_injected_data_ms = 0;
+    bool validcommand = false;
 
     struct PACKED msg4007
     {