diff --git a/libraries/SX1278FSK/SX1278FSK.cpp b/libraries/SX1278FSK/SX1278FSK.cpp
index ba11527..9f0263a 100644
--- a/libraries/SX1278FSK/SX1278FSK.cpp
+++ b/libraries/SX1278FSK/SX1278FSK.cpp
@@ -701,8 +701,6 @@ uint8_t SX1278FSK::receivePacketTimeout(uint32_t wait, byte *data)
 	state = receive();
 	if(state != 0) { return state; }
 
-	boolean p_received = false;
-
 #if (SX1278FSK_debug_mode > 0)
 	Serial.println(F("RX mode sucessfully activated"));
 #endif
diff --git a/libraries/SondeLib/DFM.cpp b/libraries/SondeLib/DFM.cpp
index 227a5c8..1243b69 100644
--- a/libraries/SondeLib/DFM.cpp
+++ b/libraries/SondeLib/DFM.cpp
@@ -162,7 +162,7 @@ void DFM::printRaw(const char *label, int len, int ret, const uint8_t *data)
 	Serial.print(" ");
 }
 
-int DFM::decodeCFG(uint8_t *cfg)
+void DFM::decodeCFG(uint8_t *cfg)
 {
 	static int lowid, highid, idgood=0, type=0;
 	if((cfg[0]>>4)==0x06 && type==0) {   // DFM-6 ID
@@ -189,7 +189,7 @@ int DFM::decodeCFG(uint8_t *cfg)
 	}
 }
 
-int DFM::decodeDAT(uint8_t *dat)
+void DFM::decodeDAT(uint8_t *dat)
 {
 	Serial.print(" DAT["); Serial.print(dat[6]); Serial.print("]: ");
 	switch(dat[6]) {
@@ -256,7 +256,7 @@ int DFM::decodeDAT(uint8_t *dat)
 	}
 }
 
-int DFM::bitsToBytes(uint8_t *bits, uint8_t *bytes, int len)
+void DFM::bitsToBytes(uint8_t *bits, uint8_t *bytes, int len)
 {
 	int i;
 	for(i=0; i<len*4; i++) {
@@ -300,9 +300,10 @@ int DFM::receive() {
 	return RX_OK;
 }
 
-// maybe move to a single function in Sonde()? maybe not, we can do custom additional 
+// moved to a single function in Sonde(). This function can be used for additional
 // processing here, that takes too long for doing in the RX task loop
 int DFM::waitRXcomplete() {
+#if 0
 	int res=0;
 	uint32_t t0 = millis();
 	while( rxtask.receiveResult < 0 && millis()-t0 < 2000) { delay(50); }
@@ -317,6 +318,8 @@ int DFM::waitRXcomplete() {
         rxtask.receiveResult = -1;
         Serial.printf("waitRXcomplete returning %d\n", res);
         return res;
+#endif
+	return 0;
 }
 
 DFM dfm = DFM();
diff --git a/libraries/SondeLib/DFM.h b/libraries/SondeLib/DFM.h
index e781dbb..aef7b87 100644
--- a/libraries/SondeLib/DFM.h
+++ b/libraries/SondeLib/DFM.h
@@ -30,9 +30,9 @@ private:
 	int check(uint8_t code[8]);
 	int hamming(uint8_t *ham, int L, uint8_t *sym);
 	void printRaw(const char *prefix, int len, int ret, const uint8_t* data);
-	int decodeCFG(uint8_t *cfg);
-	int decodeDAT(uint8_t *dat);
-	int bitsToBytes(uint8_t *bits, uint8_t *bytes, int len);
+	void decodeCFG(uint8_t *cfg);
+	void decodeDAT(uint8_t *dat);
+	void bitsToBytes(uint8_t *bits, uint8_t *bytes, int len);
 
 #define B 8
 #define S 4
diff --git a/libraries/SondeLib/RS41.cpp b/libraries/SondeLib/RS41.cpp
index 643c4ba..cccb489 100644
--- a/libraries/SondeLib/RS41.cpp
+++ b/libraries/SondeLib/RS41.cpp
@@ -447,7 +447,7 @@ void RS41::printRaw(uint8_t *data, int len)
 	Serial.println();
 }
 
-int RS41::bitsToBytes(uint8_t *bits, uint8_t *bytes, int len)
+void RS41::bitsToBytes(uint8_t *bits, uint8_t *bytes, int len)
 {
 	int i;
 	for(i=0; i<len*4; i++) {
@@ -485,6 +485,9 @@ int RS41::receive() {
 }
 
 int RS41::waitRXcomplete() {
+	// Currently not used. can be used for additinoal post-processing
+	// (required for RS92 to avoid FIFO overrun in rx task)
+#if 0
 	int res;
 	uint32_t t0 = millis();
 	while(rxtask.receiveResult<0 && millis()-t0 < 3000) { delay(50); }
@@ -499,6 +502,8 @@ int RS41::waitRXcomplete() {
 	rxtask.receiveResult = -1;
 	Serial.printf("waitRXcomplete returning %d\n", res);
 	return res;
+#endif
+	return 0;
 }
 
 RS41 rs41 = RS41();
diff --git a/libraries/SondeLib/RS41.h b/libraries/SondeLib/RS41.h
index e2980f8..99639ba 100644
--- a/libraries/SondeLib/RS41.h
+++ b/libraries/SondeLib/RS41.h
@@ -22,7 +22,7 @@ class RS41
 private:
 	uint32_t bits2val(const uint8_t *bits, int len);
 	void printRaw(uint8_t *data, int len);
-	int bitsToBytes(uint8_t *bits, uint8_t *bytes, int len);
+	void bitsToBytes(uint8_t *bits, uint8_t *bytes, int len);
 	int decode41(byte *data, int maxlen);
 
 #define B 8
diff --git a/libraries/SondeLib/RS92.cpp b/libraries/SondeLib/RS92.cpp
index b636627..04d3777 100644
--- a/libraries/SondeLib/RS92.cpp
+++ b/libraries/SondeLib/RS92.cpp
@@ -39,6 +39,7 @@ static uint32_t X2C_LSH(uint32_t a, int32_t length, int32_t n)
 	return (a >> -n) & m;
 }
 
+#if 0
 static double atang2(double x, double y)
 {
    double w;
@@ -57,7 +58,7 @@ static double atang2(double x, double y)
    else w = 0.0;
    return w;
 } /* end atang2() */
-
+#endif
 
 static void Gencrctab(void)
 {
@@ -183,7 +184,7 @@ RS92::RS92() {
  */
 
 
-
+#if 0
 static char crcrs(const byte frame[], uint32_t frame_len,
                 int32_t from, int32_t to)
 {
@@ -269,68 +270,7 @@ static void wgs84r(double x, double y, double z,
 /*  lat:=atan(z/(rh*(1.0 - E2))); */
 /*  heig:=sqrt(h + z*z) - EARTHA; */
 } /* end wgs84r() */
-static void posrs41(const byte b[], uint32_t b_len, uint32_t p)
-{
-   double dir;
-   double vu;
-   double ve;
-   double vn;
-   double vz;
-   double vy;
-   double vx;
-   double heig;
-   double long0;
-   double lat;
-   double z;
-   double y;
-   double x;
-   x = (double)getint32(b, b_len, p)*0.01;
-   y = (double)getint32(b, b_len, p+4UL)*0.01;
-   z = (double)getint32(b, b_len, p+8UL)*0.01;
-   wgs84r(x, y, z, &lat, &long0, &heig);
-   Serial.print(" ");
-   sonde.si()->lat = (float)(X2C_DIVL(lat,1.7453292519943E-2));
-   Serial.print(sonde.si()->lat);
-   Serial.print(" ");
-   sonde.si()->lon = (float)(X2C_DIVL(long0,1.7453292519943E-2));
-   Serial.print(sonde.si()->lon);
-   if (heig<1.E+5 && heig>(-1.E+5)) {
-      Serial.print(" ");
-      Serial.print((uint32_t)heig);
-      Serial.print("m");
-   }
-   /*speed */
-   vx = (double)getint16(b, b_len, p+12UL)*0.01;
-   vy = (double)getint16(b, b_len, p+14UL)*0.01;
-   vz = (double)getint16(b, b_len, p+16UL)*0.01;
-   vn = (-(vx*(double)sin((float)lat)*(double)
-                cos((float)long0))-vy*(double)
-                sin((float)lat)*(double)sin((float)
-                long0))+vz*(double)cos((float)lat);
-   ve = -(vx*(double)sin((float)long0))+vy*(double)
-                cos((float)long0);
-   vu = vx*(double)cos((float)lat)*(double)
-                cos((float)long0)+vy*(double)
-                cos((float)lat)*(double)sin((float)
-                long0)+vz*(double)sin((float)lat);
-   dir = X2C_DIVL(atang2(vn, ve),1.7453292519943E-2);
-   if (dir<0.0) dir = 360.0+dir;
-   sonde.si()->dir = dir;
-   Serial.print(" ");
-   sonde.si()->hs = sqrt((float)(vn*vn+ve*ve))*3.6f;
-   Serial.print(sonde.si()->hs);
-   Serial.print("km/h ");
-   Serial.print(dir);
-   Serial.print("deg ");
-   Serial.print((float)vu);
-   sonde.si()->vs = vu;
-   Serial.print("m/s ");
-   Serial.print(getcard16(b, b_len, p+18UL)&255UL);
-   Serial.print("Sats");
-   sonde.si()->alt = heig;
-   sonde.si()->validPos = true;
-} /* end posrs41() */
-
+#endif
 
 
 static int32_t reedsolomon92(uint8_t *buf, uint32_t buf_len)
@@ -371,18 +311,16 @@ void printRaw(uint8_t *data, int len)
 	Serial.println();
 }
 
-static struct CONTEXTR9 contextr9;
-
 void RS92::decodeframe92(uint8_t *data)
 {
-	uint32_t gpstime;
-	uint32_t flen;
-	uint32_t j;
+	//uint32_t gpstime;
+	//uint32_t flen;
+	//uint32_t j;
 	int32_t corr;
 	corr = reedsolomon92(data, 301ul);
-	int calok;
-	int mesok;
-	uint32_t calibok;
+	//int calok;
+	//int mesok;
+	//uint32_t calibok;
 	Serial.printf("rs corr is %d\n", corr);
 	print_frame(data, 240);
 #if 0
@@ -468,6 +406,8 @@ void RS92::printRaw(uint8_t *data, int len)
 	Serial.println();
 }
 
+#if 0
+// I guess this is old copy&paste stuff from RS41??
 int RS92::bitsToBytes(uint8_t *bits, uint8_t *bytes, int len)
 {
 	int i;
@@ -492,6 +432,7 @@ static uint8_t scramble[64] = {150U,131U,62U,81U,177U,73U,8U,152U,50U,5U,89U,
                 153U,162U,44U,147U,124U,48U,99U,245U,16U,46U,97U,208U,188U,
                 180U,182U,6U,170U,244U,35U,120U,110U,59U,174U,191U,123U,76U,
 		193U};
+#endif
 
 static byte data[5000];
 
@@ -582,6 +523,7 @@ int RS92::receive() {
 
 #define RS92MAXLEN (240)
 int RS92::waitRXcomplete() {
+#if 0
 	int res=0;
         uint32_t t0 = millis();
         while( rxtask.receiveResult == 0xFFFF && millis()-t0 < 2000) { delay(20); }
@@ -596,6 +538,8 @@ int RS92::waitRXcomplete() {
         rxtask.receiveResult = 0xFFFF;
         Serial.printf("RS92::waitRXcomplete returning %d (%s)\n", res, RXstr[res]);
         return res;
+#endif
+	return 0;
 }
 
 
diff --git a/libraries/SondeLib/Sonde.cpp b/libraries/SondeLib/Sonde.cpp
index 5aa470e..f3136f1 100644
--- a/libraries/SondeLib/Sonde.cpp
+++ b/libraries/SondeLib/Sonde.cpp
@@ -259,7 +259,7 @@ void Sonde::setup() {
 }
 
 void Sonde::receive() {
-	uint16_t res;
+	uint16_t res = 0;
 	SondeInfo *si = &sondeList[rxtask.currentSonde];
 	switch(si->type) {
 	case STYPE_RS41:
@@ -342,7 +342,7 @@ uint16_t Sonde::waitRXcomplete() {
 uint8_t Sonde::timeoutEvent() {
 	uint32_t now = millis();
 #if 1
-	Serial.printf("Timeout check: %ld - %ld vs %ld; %ld - %ld vs %ld; %ld - %ld vs %ld\n",
+	Serial.printf("Timeout check: %d - %d vs %d; %d - %d vs %d; %d - %d vs %d\n",
 		now, sonde.si()->viewStart, disp.layout->timeouts[0],
 		now, sonde.si()->rxStart, disp.layout->timeouts[1],
 		now, sonde.si()->norxStart, disp.layout->timeouts[2]);
diff --git a/libraries/SondeLib/Sonde.h b/libraries/SondeLib/Sonde.h
index bb07320..b64309f 100644
--- a/libraries/SondeLib/Sonde.h
+++ b/libraries/SondeLib/Sonde.h
@@ -60,7 +60,7 @@ typedef struct st_RXTask {
 	// via waitRXcomplete function
 	uint16_t receiveResult;
 	// status variabe set by decoder to indicate something is broken
-	int fifoOverflo;
+	// int fifoOverflo;
 } RXTask;
 
 extern RXTask rxtask;
diff --git a/libraries/SondeLib/nav_gps_vel.inc b/libraries/SondeLib/nav_gps_vel.inc
index a5b8ce6..0d7abad 100644
--- a/libraries/SondeLib/nav_gps_vel.inc
+++ b/libraries/SondeLib/nav_gps_vel.inc
@@ -307,17 +307,16 @@ static EPHEM_t *te;
 
 
 //EPHEM_t *read_RNXpephs(FILE *fp) {
-EPHEM_t *read_RNXpephs(char *file) {
-    int l, i, n;
-    char buffer[86];
+EPHEM_t *read_RNXpephs(const char *file) {
+    int l, i;
+    //char buffer[86];
     char buf[64], str[20];
-    int pbuf;
     unsigned ui;
     double dbl;
     int c;
     EPHEM_t ephem = {};
-    int count = 0;
-    long fpos;
+    // int count = 0;
+    //long fpos;
 
     File fp = SPIFFS.open(file, "r");
     if(!fp) { Serial.printf("Error opening %s\n", file); }
@@ -329,7 +328,6 @@ EPHEM_t *read_RNXpephs(char *file) {
         //buffer[82] = '\0';
 	Serial.printf("Skipping header: %s\n", line.c_str());
     } while ( fp.available()  &&  !strstr((const char *)line.c_str(), "END OF HEADER") );
-    Serial.printf("pbuf is %d\n", pbuf);
     if (!fp.available()) return NULL;
 /*
     fpos = ftell(fp);
@@ -352,7 +350,8 @@ EPHEM_t *read_RNXpephs(char *file) {
     te = (EPHEM_t *)calloc( 34, sizeof(ephem) ); // calloc( 1, sizeof(ephem) );
     if (te == NULL) return NULL;
 
-    n = 0;
+    //int n = 0;
+
 
     while (true) {  // brdc/hour-rinex sollte nur Daten von einem Tag enthalten
 
@@ -437,7 +436,7 @@ EPHEM_t *read_RNXpephs(char *file) {
 
         ephem.week = 1; // ephem.gpsweek
 	Serial.printf("Reading ephem for prn %d\n", ui);
-	if(ui>=0 && ui<33) {
+	if(ui<33) {
 		te[ui] = ephem;
 	} else {
 		Serial.printf("bad prn: %d\n", ui);
diff --git a/libraries/SondeLib/rs92gps.inc b/libraries/SondeLib/rs92gps.inc
index ccf7f71..930249d 100644
--- a/libraries/SondeLib/rs92gps.inc
+++ b/libraries/SondeLib/rs92gps.inc
@@ -762,7 +762,7 @@ int calc_satpos_alm(EPHEM_t alm[], double t, SAT_t *satp) {
 int calc_satpos_rnx(EPHEM_t eph[][24], double t, SAT_t *satp) {
     double X, Y, Z, vX, vY, vZ;
     int j, i, ti;
-    int week;
+    int week = 0;
     double cl_corr, cl_drift;
     double tdiff, td;
 
@@ -818,7 +818,7 @@ int calc_satpos_rnx(EPHEM_t eph[][24], double t, SAT_t *satp) {
 int calc_satpos_rnx2(EPHEM_t *eph, double t, SAT_t *satp) {
     double X, Y, Z, vX, vY, vZ;
     int j;
-    int week;
+    int week = 0;
     double cl_corr, cl_drift;
     double tdiff, td;
     int count, count0, satfound;
@@ -985,7 +985,7 @@ int get_pseudorange() {
 */
 	Serial.printf("j=%d: prns=%d status=%d  dist=%f\n", j, prns[j], sat_status[j], dist(sat[prns[j]].X, sat[prns[j]].Y, sat[prns[j]].Z, 0, 0, 0));
 	int o=prns[j];
-	Serial.printf("x=%d y=%d z=%d\n", sat[o].X, sat[o].Y, sat[o].Z);
+	Serial.printf("x=%f y=%f z=%f\n", sat[o].X, sat[o].Y, sat[o].Z);
         if (  (prns[j] > 0)  &&  ((sat_status[j] & 0x0F) == 0xF)
            && (dist(sat[prns[j]].X, sat[prns[j]].Y, sat[prns[j]].Z, 0, 0, 0) > 6700000) )
         {
@@ -1063,7 +1063,7 @@ int get_GPSkoord(int N) {
     SAT_t Sat_B[12]; // N <= 12
     SAT_t Sat_B1s[12];
     SAT_t Sat_C[12]; // 11
-    double diter;
+    double diter = 0;
     int exN = -1;
 
     if (option_vergps == 8) {
@@ -1387,7 +1387,7 @@ void print_frame(uint8_t *data, int len) {
     else print_position();
 }
 
-void get_eph(char *file) {
+void get_eph(const char *file) {
         ephs = read_RNXpephs(file);
         if (ephs) {
             ephem = 1;