diff --git a/code/IP400/Inc/setup.h b/code/IP400/Inc/setup.h
index 6e61e79..41bda26 100644
--- a/code/IP400/Inc/setup.h
+++ b/code/IP400/Inc/setup.h
@@ -29,6 +29,7 @@
 #include "usart.h"
 
 #define	__USE_SETUP_PARAMS	1				// set to 1 to use setup parameters
+#define	US					0				// station is in the US
 
 // defined elsewhere
 extern char *modTypes[];
diff --git a/code/IP400/Inc/streambuffer.h b/code/IP400/Inc/streambuffer.h
index 11deb76..bcad0da 100644
--- a/code/IP400/Inc/streambuffer.h
+++ b/code/IP400/Inc/streambuffer.h
@@ -12,7 +12,7 @@
 typedef uint8_t			DATA_ELEMENT;		// data element
 #define                 BUFFER_EMPTY(x)		(x.nDataBytes == 0)
 #define                 BUFFER_NO_DATA		0
-#define	bufferSIZE		2048                // large buffer
+#define	bufferSIZE		512                // large buffer
 
 
 #endif /* INC_STREAMBUFFER_H_ */
diff --git a/code/IP400/Inc/usart.h b/code/IP400/Inc/usart.h
index c3eb5f7..679d83b 100644
--- a/code/IP400/Inc/usart.h
+++ b/code/IP400/Inc/usart.h
@@ -33,13 +33,15 @@ typedef uint16_t		BUFFER_SIZE_T;		// buffer size type
 typedef uint8_t			DATA_ELEMENT;		// buffer data element
 
 // uart HAL handle
-extern UART_HandleTypeDef huart1;
+extern UART_HandleTypeDef huart1;			// console UART
+extern UART_HandleTypeDef hlpuart1 ;		// GPS UART
 
 // logger defines
 #define	LOG_NOTICE		0			// notice
 #define LOG_ERROR		1			// error
 #define	LOG_SEVERE		2			// severe error
 
+// logger
 void logger(int severity, char *format, ...);
 
 // API calls
@@ -51,4 +53,9 @@ BOOL USART_Send_String(const char *string, size_t len);
 BOOL USART_Send_Char(const char c);
 void USART_Print_string(char *format, ...);
 
+// same as USART but for LPUART: no Tx functions
+void LPUART_RxBuffer_reset(void);
+size_t gpsbuffer_bytesInBuffer(void);
+DATA_ELEMENT gpsbuffer_get(UART_TIMEOUT_T timeout);
+
 #endif /* INC_USART_H_ */
diff --git a/code/IP400/Src/beacon.c b/code/IP400/Src/beacon.c
index f22ce18..e035242 100644
--- a/code/IP400/Src/beacon.c
+++ b/code/IP400/Src/beacon.c
@@ -33,26 +33,41 @@
 #include <FreeRTOS.h>
 #include <stm32wl3x_hal.h>
 
+#include "config.h"
 #include "frame.h"
 #include "tasks.h"
 #include "setup.h"
 #include "utils.h"
 #include "tod.h"
+#include "usart.h"
 
 // config
-#define	__ENABLE_GPS	0				// set to 1 if you have GPS attached
 #define	__SPEED_DAEMON	0				// send beacon every 5 seconds for testing purposes
 
 // local defines
-#define	MAX_BEACON		80
-#define	GPS_FIX_LEN		20				// gps fix length
+#define	MAX_BEACON			80			// max beacon string
+#define	GPS_FIX_LEN			20			// gps fix length
+#define	GPS_BFR_SIZE		140			// GPS buffer size
+
 // NMEA GGA Sentence fields
-#define	GGA_TAG			0				// message tag
-#define	GGA_TIMESTAMP	1				// time of fix
-#define	GGA_LATITUDE	2				// latitude
-#define	GGA_NS_HEMI		3				// latitude hemisphere
-#define	GGA_LONGITUDE	4				// longitude
-#define	GGA_EW_HEMI		5				// longitude hemisphere
+char *nmeaMsgTag = "RMC";				// sentence we are processing
+enum {
+	NMEA_TAG=0,			// message tag
+	NMEA_TIMESTAMP,		// time of fix'
+	NMEA_STATUS,		// status
+	NMEA_LATITUDE,		// latitude
+	NMEA_NS_HEMI,		// latitude hemisphere
+	NMEA_LONGITUDE,		// longitude
+	NMEA_EW_HEMI,		// longitude hemisphere
+	NMEA_MIN_FLDS		// minimum fields in GPS message
+};
+
+// NMEA processing states
+enum {
+	NMEA_STATE_SOM=0,	// start of message
+	NMEA_STATE_MSG,		// in the message
+};
+
 // hemispheres
 enum {
 	N_HEMI=0,		// North
@@ -68,27 +83,34 @@ uint8_t hemispheres[N_HEMIS] = {
 
 uint32_t	timerInitValue;			// value to initialize timer
 uint32_t	timerCtrValue;			// current counter
-
 BEACON_HEADER	beacon_hdr;			// beacon header
 uint8_t		bcnPayload[MAX_BEACON];	// beacon payload
-
 BOOL gpsMessageRx = FALSE;
+BOOL GPSBusy=FALSE;
+TIMEOFDAY wallClockTime;
 
 #if __ENABLE_GPS
-#define	GPS_BUFFER_SIZE		200
-// LPUART for GPS receiver
-extern hlpuart1 UART_HandleTypeDef;	// HAL Handle to LPUART
-uint8_t GPSMsgBuf[GPS_BUFFER_SIZE];
+// data for GPS
+uint8_t GPSMsgBuf[GPS_BFR_SIZE];
+uint8_t GPSEchoBuf[GPS_BFR_SIZE];
+uint8_t GPSProcBuf[GPS_BFR_SIZE];
+uint8_t *GPSBufPtr;
+uint8_t GPSMsgSize;
+uint8_t NMEAState;
+//
+BOOL haveGPSFix = FALSE;
+BOOL gpsEchoReady=FALSE;
+//
 char GPSLat[GPS_FIX_LEN];
 char GPSLong[GPS_FIX_LEN];
 char GPSFixTime[GPS_FIX_LEN];
-BOOL haveGPSFix = FALSE;
-char *gpsFlds[GPS_FIX_LEN];
-#else
-TIMEOFDAY wallClockTime;
+char *gpsFlds[GPS_BFR_SIZE];
+
+// fwd Refs in this module in GPS mode
+BOOL processGPSMessage(uint8_t *GPSMsgBuf, uint8_t bufferSize);
 #endif
 
-// fwd refs here..
+//fwd refs w/o GPS
 void GPSFormat(char *buffer, double value, uint8_t hePos, uint8_t heNeg);
 
 // initialization: calculate the init value in
@@ -107,9 +129,12 @@ void Beacon_Task_init(void)
 
 	// GPS Init
 #if __ENABLE_GPS
-    HAL_LPUART_Receive_DMA(&hlpuart1, (uint8_t*)GPSMsgBuf, GPS_BUFFER_SIZE);
     gpsMessageRx = FALSE;
     haveGPSFix = FALSE;
+    gpsEchoReady = FALSE;
+    GPSBufPtr = GPSMsgBuf;
+    GPSBusy = FALSE;
+    NMEAState=NMEA_STATE_SOM;
 #endif
 
 }
@@ -119,9 +144,11 @@ void Beacon_Task_exec(void)
 {
 #if __ENABLE_GPS
 	if(gpsMessageRx)	{
-	    gpsMessageRx = FALSE;
-	    ifprocessGPSMessage(GPSMsgBuf, GPS_BUFFER_SIZE))
+		// process the message
+		if(processGPSMessage(GPSProcBuf, (uint8_t)strlen((char *)GPSProcBuf)))	{
 			haveGPSFix = TRUE;
+	    }
+        gpsMessageRx = FALSE;
 	}
 #endif
 
@@ -148,10 +175,13 @@ void Beacon_Task_exec(void)
 	if(haveGPSFix)		{
 		strcpy(pPayload, "GPS,");
 		strcat(pPayload, GPSLat);
+		strcat(pPayload, ",");
 		strcat(pPayload, GPSLong);
+		strcat(pPayload, ",");
 		strcat(pPayload, GPSFixTime);
+		strcat(pPayload, ",");
 	} else {
-#else
+#endif
 	// setup struct generated payload
 	strcpy(pPayload, "FXD,");
 	pPayload += strlen(pPayload);
@@ -161,7 +191,10 @@ void Beacon_Task_exec(void)
 	pPayload += strlen(pPayload);
 	double dlong = ascii2double(setup_memory.params.setup_data.longitude);
 	GPSFormat(pPayload, dlong, E_HEMI, W_HEMI);
-	strcat(pPayload, ",");
+	strcat(pPayload, ",,");
+#if __ENABLE_GPS
+	}
+#endif
 	pPayload += strlen(pPayload);
 
 	// Use RTC for time
@@ -171,7 +204,6 @@ void Beacon_Task_exec(void)
 
 	// home grid square
 	strcat(pPayload, setup_memory.params.setup_data.gridSq);
-#endif
 
 	// firmware version
 	int pos = strlen((char *)p2);
@@ -206,39 +238,93 @@ void GPSFormat(char *buffer, double value, uint8_t hePos, uint8_t heNeg)
 	sprintf(buffer, "%d%02d.%05d%c", whole, min, ifract, hemispheres[hemi]);
 }
 
+
+
+/*
+ * Process GPS data from LPUART: runs at a higher priority
+ */
+void GPS_Task_exec(void)
+{
+#if __ENABLE_GPS
+	char c;
+	int nBytesinBuff;
+
+	if((nBytesinBuff=gpsbuffer_bytesInBuffer()) == 0)
+		return;
+
+	for(int i=0;i<nBytesinBuff;i++)		{
+		c = (char)gpsbuffer_get(0);
+
+		switch(NMEAState)	{
+
+		// waiting for a start of message
+		case NMEA_STATE_SOM:
+			if(c != '$')
+				break;
+			GPSBufPtr = GPSMsgBuf;
+			NMEAState=NMEA_STATE_MSG;
+			break;
+
+		// collecting chars in a message
+		case NMEA_STATE_MSG:
+			*GPSBufPtr++ = c;
+			GPSMsgSize = GPSBufPtr - GPSMsgBuf;
+			if((c == '*') || (GPSMsgSize >= GPS_BFR_SIZE)) {
+				*GPSBufPtr = '\0';
+				GPSMsgSize++;
+				memcpy(GPSEchoBuf, GPSMsgBuf, GPSMsgSize);
+				gpsMessageRx = TRUE;
+				memcpy(GPSProcBuf, GPSMsgBuf, GPSMsgSize);
+				memcpy(GPSEchoBuf, GPSMsgBuf, GPSMsgSize);
+				gpsEchoReady = TRUE;
+				NMEAState=NMEA_STATE_SOM;
+			}
+			break;
+		}
+	}
+#else
+		return;				// unused code
+#endif
+}
+
 #if __ENABLE_GPS
 /*
  * Process an inbound GPS message
  */
-BOOL processGPSMessage(GPSMsgBuf, GPS_BUFFER_SIZE)
+BOOL processGPSMessage(uint8_t *GPSdata, uint8_t bufferSize)
 {
-	int limit = (int)strlen(GPSMsgBuf);
-	nParams = explode_string(GPSMsgBuf, gpsFlds, limit, ',', '"');
-	if (nParams == 0)
+	char *msg = (char *)GPSdata;
+	uint8_t nParams = explode_string(msg, gpsFlds, bufferSize, ',', '"');
+	if ((nParams == 0) || (nParams < NMEA_MIN_FLDS))
 		return FALSE;
 
-	//brute force position fix
-	if(strcmp(gpsFlds[GGA_TAG[strlen(GGA_TAG)-strlen("GGA")]],"GGA"))
+	//	brute force position fix
+	// check for message with GGA at the end
+	char *gpsTag = gpsFlds[NMEA_TAG];
+	gpsTag += strlen(gpsTag)-strlen(nmeaMsgTag);
+	if(strcmp(gpsTag, nmeaMsgTag))
 		return FALSE;
 
-	strpy(GPSFixTime, gpsFlds[GGA_TIMESTAMP]);
+	strcpy(GPSFixTime, gpsFlds[NMEA_TIMESTAMP]);
 
-	strcpy(GPSLat, gpsFlds[GGA_LATITUDE]);
-	strcat(GPSLat, gpsFlds[GGA_NS_HEMI]);
+	strcpy(GPSLat, gpsFlds[NMEA_LATITUDE]);
+	strcat(GPSLat, gpsFlds[NMEA_NS_HEMI]);
 
-	strcpy(GPSLong, gpsFlds[GGA_LONGITUDE]);
-	strcat(GPSLong, gpsFlds[GGA_EW_HEMI]);
+	strcpy(GPSLong, gpsFlds[NMEA_LONGITUDE]);
+	strcat(GPSLong, gpsFlds[NMEA_EW_HEMI]);
 
 	return TRUE;
 }
 
 /*
- * callback from GPS receiver when rx is complete
+ * echo the last GPS message on the console
  */
-void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
+void GPSEcho(void)
 {
-    HAL_LPUART_Receive_DMA(&hlpuart1, (uint8_t*)GPSMsgBuf, GPS_BUFFER_SIZE);
-    gpsMessageRx = TRUE;
-	return;
+	if(!gpsEchoReady)
+		return;
+
+	USART_Print_string("%s\r\n", (char *)GPSEchoBuf);
+	gpsEchoReady=FALSE;
 }
 #endif
diff --git a/code/IP400/Src/frame.c b/code/IP400/Src/frame.c
index a668944..fe8bdf2 100644
--- a/code/IP400/Src/frame.c
+++ b/code/IP400/Src/frame.c
@@ -34,7 +34,6 @@
 #include <stm32wl3x_nucleo.h>
 #endif
 
-
 #include <cmsis_os2.h>
 #include <FreeRTOS.h>
 #include <semphr.h>
@@ -429,7 +428,7 @@ void Frame_Rxtask_exec(void)
 		case ICMP_TYPE:
 			Mesh_ProcessBeacon((void *)&rFrame, Stats.lastRSSI);
 #if __DUMP_BEACON
-			EnqueChatFrame((void *)&rFrame, length);
+			EnqueChatFrame((void *)&rFrame, length+3);
 #endif
 			Stats.nBeacons++;
 			break;
diff --git a/code/IP400/Src/menu.c b/code/IP400/Src/menu.c
index 29c2dc5..d6690d8 100644
--- a/code/IP400/Src/menu.c
+++ b/code/IP400/Src/menu.c
@@ -28,6 +28,7 @@
 #include "tasks.h"
 #include "utils.h"
 #include "tod.h"
+#include "config.h"
 
 // menu state
 uint8_t menuState;		// menu state
@@ -97,6 +98,7 @@ void Print_Frame_stats(FRAME_STATS *stats);
 void Print_Radio_errors(uint32_t errs);
 void Print_FSM_state(uint8_t state);
 uint8_t getEntry(int activeMenu, int item);
+uint8_t getKeyEntry(void);
 
 // list of menus
 enum	{
@@ -212,6 +214,13 @@ uint8_t setParam(void)
 {
 	return(getEntry(activeMenu, sel_item));
 }
+#if __ENABLE_GPS
+uint8_t gpsEcho(void)
+{
+	GPSEcho();
+	return(getKeyEntry());
+}
+#endif
 
 /*
  * main menu definition
@@ -226,12 +235,20 @@ struct menuItems_t {
 };
 
 // main menu
+#if __ENABLE_GPS
+#define N_MAINMENU	11			// additional menu item for GPS
+#else
 #define N_MAINMENU	10			// number of lines in the menu
+#endif
+
 struct menuItems_t mainMenu[N_MAINMENU] = {
 		{ "List setup parameters\r\n", 'A', printAllSetup },
 		{ "Mesh Status\r\n", 'B', listMesh },
 		{ "Chat Mode\r\n", 'C', chatMode },
 		{ "Dump Frame stats\r\n", 'D', showstats },
+#if __ENABLE_GPS
+		{ "GPS Echo mode\r\n", 'G', gpsEcho },
+#endif
 		{ "LED test\r\n", 'L', ledTest },
 		{ "Set Radio Parameters\r\n", 'R', setRadio },
 		{ "Set Station Parameters\r\n", 'S', setStation },
diff --git a/code/IP400/Src/setup.c b/code/IP400/Src/setup.c
index 789cdff..844f869 100644
--- a/code/IP400/Src/setup.c
+++ b/code/IP400/Src/setup.c
@@ -96,7 +96,13 @@ STN_PARAMS *GetStationParams(void)			// get the station params
 // returns true if callsigns match
 BOOL CompareToMyCall(char *call)
 {
-	if(!strncmp(call, setup_memory.params.setup_data.stnCall, MAX_CALL))
+	char expCall[20];
+
+	// make sure call sign is padded out to 6 characters b4 comparison
+	strcpy(expCall, setup_memory.params.setup_data.stnCall);
+	strcat(expCall, "      ");
+
+	if(!strncmp(call, expCall, MAX_CALL))
 		return TRUE;
 	return FALSE;
 }
diff --git a/code/IP400/Src/usart.c b/code/IP400/Src/usart.c
index 0962f68..150a6f5 100644
--- a/code/IP400/Src/usart.c
+++ b/code/IP400/Src/usart.c
@@ -29,6 +29,7 @@
 #include <FreeRTOS.h>
 #include <semphr.h>
 
+#include "config.h"
 #include "stream_buffer.h"
 #include "types.h"
 #include "streambuffer.h"
@@ -46,33 +47,59 @@ StaticStreamBuffer_t   	USART_StreamBuffer;
 SemaphoreHandle_t 	txCompleted;		// tx completed semaphore
 static DATA_ELEMENT USARTRxChar[10];	// last received character
 
-uint8_t buffer_data[bufferSIZE];
+uint8_t usart_data[bufferSIZE];
 char usartPrintBuffer[200];
 
 // fwd refs here...
 void USART_Receive_char(void);
 
+#if __ENABLE_GPS
+#define	LPUART_DMA_SIZE			32
+static DATA_ELEMENT LPUARTRxChar[LPUART_DMA_SIZE];
+
+void LPUART_Receive_char(void);
+
+StreamBufferHandle_t	LPUART_RxBuffer;			// handle to buffer
+StaticStreamBuffer_t   	LPUART_StreamBuffer;
+uint8_t gps_data[bufferSIZE];
+#endif
+
 /*
  * API for the rx data buffer
  */
 void USART_API_init(void)
 {
-	USART_RxBuffer = xStreamBufferCreateStatic(bufferSIZE, 1, buffer_data, &USART_StreamBuffer);
-	USART_RxBuffer_reset();
-
 	// create the tx completed semaphore
     txCompleted = xSemaphoreCreateBinary();
 
-    // start the rx process
+    // start USART
+	USART_RxBuffer = xStreamBufferCreateStatic(bufferSIZE, 1, usart_data, &USART_StreamBuffer);
+	USART_RxBuffer_reset();
     USART_Receive_char();
+
+#if __ENABLE_GPS
+	LPUART_RxBuffer = xStreamBufferCreateStatic(bufferSIZE, 1, gps_data, &LPUART_StreamBuffer);
+	LPUART_RxBuffer_reset();
+    LPUART_Receive_char();
+#endif
 }
 
+// reset the data buffer
 void USART_RxBuffer_reset(void)
 {
 	xStreamBufferReset(USART_RxBuffer);
 	return;
 }
 
+#if __ENABLE_GPS
+// reset the LPUART Buffer
+void LPUART_RxBuffer_reset(void)
+{
+	xStreamBufferReset(LPUART_RxBuffer);
+	return;
+}
+#endif
+
 // return the number of byte in the buffer
 size_t databuffer_bytesInBuffer(void)
 {
@@ -99,6 +126,35 @@ DATA_ELEMENT databuffer_get(UART_TIMEOUT_T timeout)
 	return retval;
 }
 
+/*
+ * Similar but from GPS buffer
+ */
+#if __ENABLE_GPS
+// return the number of byte in the buffer
+size_t gpsbuffer_bytesInBuffer(void)
+{
+	size_t nBytes = xStreamBufferBytesAvailable(LPUART_RxBuffer);
+	return nBytes;
+}
+// get a bytes
+DATA_ELEMENT gpsbuffer_get(UART_TIMEOUT_T timeout)
+{
+	DATA_ELEMENT retval;
+
+	TickType_t tickTimeout;
+
+	if(timeout == 0)
+		tickTimeout = portMAX_DELAY;
+	else
+		tickTimeout = pdMS_TO_TICKS(timeout);
+
+	if(xStreamBufferReceive(LPUART_RxBuffer, &retval, 1, tickTimeout) == 0)
+		return BUFFER_NO_DATA;
+
+	return retval;
+}
+#endif
+
 // see if the buffer contains a keyword, save data up to it if needed
 BOOL databuffer_contains(const char *tag, UART_TIMEOUT_T rx_timeout, BOOL saveData, char *SaveBuffer)
 {
@@ -193,13 +249,40 @@ void USART_Receive_char(void)
 	HAL_UART_Receive_IT(&huart1,(uint8_t *)USARTRxChar,1);
 }
 
+
 // callback function when rx is completed: overrides previous
 // __weak definition
+// NB: Console USART and GPS LPUART share the same HAL routine
 void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
 {
-
-	// do not store any control chars
+#if __ENABLE_GPS
+	// service the LPUART
+	if(huart->Instance == LPUART1)	{
+		xStreamBufferSendFromISR(LPUART_RxBuffer, LPUARTRxChar, 1, NULL);
+		HAL_UART_Receive_IT(&hlpuart1,(uint8_t *)LPUARTRxChar,1);
+		return;
+	}
+#endif
+	// service the USART
 	xStreamBufferSendFromISR(USART_RxBuffer, USARTRxChar, 1, NULL);
 	HAL_UART_Receive_IT(&huart1,(uint8_t *)USARTRxChar,1);
 }
 
+#if __ENABLE_GPS
+// receive a byte with DMA, wait for DMA completed interrupt
+void LPUART_Receive_char(void)
+{
+	HAL_UART_Receive_IT(&hlpuart1,(uint8_t *)LPUARTRxChar,1);
+	// HAL_UARTEx_ReceiveToIdle_DMA(&hlpuart1,(uint8_t *)LPUARTRxChar,LPUART_DMA_SIZE);
+	//__HAL_DMA_DISABLE_IT(&hlpuart1, DMA_IT_HT);
+}
+
+
+// callback from GPS Rx
+void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
+{
+	xStreamBufferSendFromISR(LPUART_RxBuffer, LPUARTRxChar, Size, NULL);
+	HAL_UARTEx_ReceiveToIdle_DMA(&hlpuart1,(uint8_t *)LPUARTRxChar,LPUART_DMA_SIZE);
+}
+
+#endif