diff --git a/README.md b/README.md
index 98e6705..49163e6 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,8 @@ SondeHub integration has mainly been tested with RS41 and DFM.
 
 
 Support for other radiosondes that use AFSK modulation is not feasible with the TTGO hardware.
-In particular, decoding iMet radiosondes is not practical.
+In particular, decoding iMet-1/iMet-4 radiosondes is not practical (iMet-5x seems to use FSK,
+so should be feasible to implement).
 
 Adding support for LMS6 (see issue #48) and ims100 (see branch ims100) could be feasible,
 but currently I don't have plans to do add this myself. Well-tested pull requests will of
diff --git a/RX_FSK/data/livemap.js b/RX_FSK/data/livemap.js
index c8f3c8d..0ff62da 100644
--- a/RX_FSK/data/livemap.js
+++ b/RX_FSK/data/livemap.js
@@ -321,7 +321,7 @@ headtxt = function(data,stat) {
     var datetime = m.getUTCFullYear() + "-" + az(m.getUTCMonth()+1) + "-" + az(m.getUTCDate()) + "T" +
       az(m.getUTCHours()) + ":" + az(m.getUTCMinutes()) + ":" + az(m.getUTCSeconds()) + "Z";
     var url = 'https://predict.cusf.co.uk/api/v1/';
-    url += '?launch_latitude='+data.lat + '&launch_longitude='+data.lon;
+    url += '?launch_latitude='+data.lat + '&launch_longitude='+fix_lon(data.lon);
     url += '&launch_altitude='+data.alt + '&launch_datetime='+datetime;
     url += '&ascent_rate='+ascent + '&burst_altitude=' + burst + '&descent_rate='+descent;
 
@@ -333,11 +333,11 @@ headtxt = function(data,stat) {
   draw_predict = function(prediction,data) {
     var ascending = prediction.prediction[0].trajectory;
     var highest = ascending[ascending.length-1];
-    var highest_location = [highest.latitude,highest.longitude];
+    var highest_location = [highest.latitude,fix_lon(highest.longitude)];
 
     var descending = prediction.prediction[1].trajectory;
     var landing = descending[descending.length-1];
-    var landing_location = [landing.latitude,landing.longitude];
+    var landing_location = [landing.latitude,fix_lon(landing.longitude)];
 
     if (!marker_landing) {
       marker_landing = L.marker(landing_location,{icon: icon_landing}).addTo(map)
@@ -353,7 +353,7 @@ headtxt = function(data,stat) {
     dots_predict=[];
 
     if (data.climb > 0) {
-      ascending.forEach(p => dots_predict.push([p.latitude,p.longitude]));
+      ascending.forEach(p => dots_predict.push([p.latitude,fix_lon(p.longitude)]));
 
       if (!marker_burst) {
         marker_burst = L.marker(highest_location,{icon:icon_burst}).addTo(map).bindPopup(poptxt('burst',highest),{closeOnClick:false, autoPan:false});
@@ -365,7 +365,7 @@ headtxt = function(data,stat) {
       }
     }
 
-    descending.forEach(p => dots_predict.push([p.latitude,p.longitude]));
+    descending.forEach(p => dots_predict.push([p.latitude,fix_lon(p.longitude)]));
     line_predict.setLatLngs(dots_predict);
 
     if (data.climb > 0) {
@@ -378,6 +378,12 @@ headtxt = function(data,stat) {
     clearTimeout(predictor);
     predictor = setTimeout(function() {get_predict(last_data);}, predictor_time*1000);
   };
+  
+  fix_lon = function(lon) {
+    if (lon > 180) { return lon - 360; }
+    if (lon < 0) { return lon + 360; }
+    return lon;
+  };
 
   poptxt = function(t,i) {
     var lat_input = (i.id)?i.lat:i.latitude;
diff --git a/RX_FSK/version.h b/RX_FSK/version.h
index 2aef016..eae4680 100644
--- a/RX_FSK/version.h
+++ b/RX_FSK/version.h
@@ -1,4 +1,4 @@
 const char *version_name = "rdzTTGOsonde";
-const char *version_id = "devel20210817";
+const char *version_id = "devel20210905";
 const int SPIFFS_MAJOR=2;
 const int SPIFFS_MINOR=14;
diff --git a/libraries/SondeLib/Sonde.cpp b/libraries/SondeLib/Sonde.cpp
index 9f6f6c2..5e9af67 100644
--- a/libraries/SondeLib/Sonde.cpp
+++ b/libraries/SondeLib/Sonde.cpp
@@ -122,6 +122,11 @@ void Sonde::defaultConfig() {
 #define BM8563_ADDRESS 0x51
 				Wire.beginTransmission(BM8563_ADDRESS);
 				byte err = Wire.endTransmission();
+				if(err) { // try again
+				  delay(400);
+				  Wire.beginTransmission(BM8563_ADDRESS);
+				  err = Wire.endTransmission();
+				}
 				if(err==0) {
 					Serial.println("M5stack Core2 board detected\n");
 					config.type = TYPE_M5_CORE2;
@@ -447,6 +452,10 @@ void Sonde::addSonde(float frequency, SondeType type, int active, char *launchsi
 		return;
 	}
 	Serial.printf("Adding %f - %d - %d - %s\n", frequency, type, active, launchsite);
+	// reset all data if type or frequency has changed
+	if(type != sondeList[nSonde].type || frequency != sondeList[nSonde].freq) {
+    	    memset(&sondeList[nSonde], 0, sizeof(SondeInfo));
+	}
 	sondeList[nSonde].type = type;
 	sondeList[nSonde].typestr[0] = 0;
 	sondeList[nSonde].freq = frequency;