diff --git a/apps.json b/apps.json
index c1f51f272..682c399c4 100644
--- a/apps.json
+++ b/apps.json
@@ -4649,7 +4649,7 @@
   "id": "sensible",
   "name": "SensiBLE",
   "shortName": "SensiBLE",
-  "version": "0.03",
+  "version": "0.04",
   "description": "Collect, display and advertise real-time sensor data.",
   "icon": "sensible.png",
   "screenshots": [
diff --git a/apps/sensible/ChangeLog b/apps/sensible/ChangeLog
index baa93f297..c50431f51 100644
--- a/apps/sensible/ChangeLog
+++ b/apps/sensible/ChangeLog
@@ -1,3 +1,4 @@
 0.01: New App!
 0.02: Corrected variable initialisation
 0.03: Advertise app name, added screenshots
+0.04: Advertise bar, GPS, HRM and mag services
diff --git a/apps/sensible/README.md b/apps/sensible/README.md
index f79b61aea..fcff3b0f9 100644
--- a/apps/sensible/README.md
+++ b/apps/sensible/README.md
@@ -17,7 +17,7 @@ Currently implements:
 - Heart Rate Monitor
 - Magnetometer
 
-in the menu display but NOT YET in Bluetooth Low Energy advertising (which will be implemented in a subsequent version).
+in the menu display, and broadcasts all sensor data readings _except_ acceleration in Bluetooth Low Energy advertising packets as GATT characteristic services.
 
 
 ## Controls
diff --git a/apps/sensible/sensible.js b/apps/sensible/sensible.js
index 45852adab..3da39998e 100644
--- a/apps/sensible/sensible.js
+++ b/apps/sensible/sensible.js
@@ -7,6 +7,9 @@
 // Non-user-configurable constants
 const APP_ID = 'sensible';
 const ESPRUINO_COMPANY_CODE = 0x0590;
+const APP_ADVERTISING_DATA = [ 0x12, 0xff, 0x90, 0x05, 0x7b, 0x6e, 0x61, 0x6d,
+                               0x65, 0x3a, 0x73, 0x65, 0x6e, 0x73, 0x69, 0x62,
+                               0x6c, 0x65, 0x7d ];
 
 
 // Global variables
@@ -20,6 +23,12 @@ let isBarEnabled = true;
 let isGpsEnabled = true;
 let isHrmEnabled = true;
 let isMagEnabled = true;
+let isNewAccData = false;
+let isNewBarData = false;
+let isNewGpsData = false;
+let isNewHrmData = false;
+let isNewMagData = false;
+
 
 
 // Menus
@@ -91,22 +100,121 @@ let magMenu = {
 };
 
 
-// Transmit the app name under the Espruino company code to facilitate discovery
-function transmitAppName() {
-  let options = {
-      showName: false,
-      manufacturer: ESPRUINO_COMPANY_CODE,
-      manufacturerData: JSON.stringify({ name: APP_ID }),
-      interval: 2000
+// Check for new sensor data and update the advertising sequence
+function transmitUpdatedSensorData() {
+  let data = [ APP_ADVERTISING_DATA ]; // Always advertise at least app name
+
+  if(isNewBarData) {
+    data.push(encodeBarServiceData());
+    isNewBarData = false;
   }
 
-  NRF.setAdvertising({}, options);
+  if(isNewGpsData && gps.lat && gps.lon) {
+    data.push(encodeGpsServiceData());
+    isNewGpsData = false;
+  }
+
+  if(isNewHrmData) {
+    data.push({ 0x2a37: [ 0, hrm.bpm ] });
+    isNewHrmData = false;
+  }
+
+  if(isNewMagData) {
+    data.push(encodeMagServiceData());
+    isNewMagData = false;
+  }
+
+  NRF.setAdvertising(data, { showName: false, interval: 200 });
+}
+
+
+// Encode the bar service data to fit in a Bluetooth PDU
+function encodeBarServiceData() {
+  let tEncoded = Math.round(bar.temperature * 100);
+  let pEncoded = Math.round(bar.pressure * 100);
+  let eEncoded = Math.round(bar.altitude * 100);
+
+  if(bar.temperature < 0) {
+    tEncoded += 0x10000;
+  }
+  if(bar.altitude < 0) {
+    eEncoded += 0x1000000;
+  }
+
+  let t = [ tEncoded & 0xff, (tEncoded >> 8) & 0xff ];
+  let p = [ pEncoded & 0xff, (pEncoded >> 8) & 0xff, (pEncoded >> 16) & 0xff,
+            (pEncoded >> 24) & 0xff ];
+  let e = [ eEncoded & 0xff, (eEncoded >> 8) & 0xff, (eEncoded >> 16) & 0xff ];
+
+  return [
+      0x02, 0x01, 0x06,                               // Flags
+      0x05, 0x16, 0x6e, 0x2a, t[0], t[1],             // Temperature
+      0x07, 0x16, 0x6d, 0x2a, p[0], p[1], p[2], p[3], // Pressure
+      0x06, 0x16, 0x6c, 0x2a, e[0], e[1], e[2]        // Elevation
+  ];
+}
+
+
+// Encode the GPS service data using the Location and Speed characteristic
+function encodeGpsServiceData() {
+  let latEncoded = Math.round(gps.lat * 10000000);
+  let lonEncoded = Math.round(gps.lon * 10000000);
+  let hEncoded = Math.round(gps.course * 100);
+  let sEncoded = Math.round(1000 * gps.speed / 36);
+
+  if(gps.lat < 0) {
+    latEncoded += 0x100000000;
+  }
+  if(gps.lon < 0) {
+    lonEncoded += 0x100000000;
+  }
+
+  let s = [ sEncoded & 0xff, (sEncoded >> 8) & 0xff ];
+  let lat = [ latEncoded & 0xff, (latEncoded >> 8) & 0xff,
+              (latEncoded >> 16) & 0xff, (latEncoded >> 24) & 0xff ];
+  let lon = [ lonEncoded & 0xff, (lonEncoded >> 8) & 0xff,
+              (lonEncoded >> 16) & 0xff, (lonEncoded >> 24) & 0xff ];
+  let h = [ hEncoded & 0xff, (hEncoded >> 8) & 0xff ];
+
+  return [
+      0x02, 0x01, 0x06,                                  // Flags
+      0x11, 0x16, 0x67, 0x2a, 0x95, 0x02, s[0], s[1], lat[0], lat[1], lat[2],
+      lat[3], lon[0], lon[1], lon[2], lon[3], h[0], h[1] // Location and Speed
+  ];
+}
+
+
+// Encode the mag service data using the magnetic flux density 3D characteristic
+function encodeMagServiceData() {
+  let xEncoded = mag.x; // TODO: units???
+  let yEncoded = mag.y;
+  let zEncoded = mag.z;
+
+  if(xEncoded < 0) {
+    xEncoded += 0x10000;
+  }
+  if(yEncoded < 0) {
+    yEncoded += 0x10000;
+  }
+  if(yEncoded < 0) {
+    yEncoded += 0x10000;
+  }
+
+  let x = [ xEncoded & 0xff, (xEncoded >> 8) & 0xff ];
+  let y = [ yEncoded & 0xff, (yEncoded >> 8) & 0xff ];
+  let z = [ zEncoded & 0xff, (zEncoded >> 8) & 0xff ];
+
+  return [
+      0x02, 0x01, 0x06,                                          // Flags
+      0x09, 0x16, 0xa1, 0x2a, x[0], x[1], y[0], y[1], z[0], z[1] // Mag 3D
+  ];
 }
 
 
 // Update acceleration
 Bangle.on('accel', function(newAcc) {
   acc = newAcc;
+  isNewAccData = true;
 
   if(isAccMenu) {
     accMenu.x.value = acc.x.toFixed(2);
@@ -119,6 +227,7 @@ Bangle.on('accel', function(newAcc) {
 // Update barometer
 Bangle.on('pressure', function(newBar) {
   bar = newBar;
+  isNewBarData = true;
 
   if(isBarMenu) {
     barMenu.Altitude.value = bar.altitude.toFixed(1) + 'm';
@@ -131,6 +240,7 @@ Bangle.on('pressure', function(newBar) {
 // Update GPS
 Bangle.on('GPS', function(newGps) {
   gps = newGps;
+  isNewGpsData = true;
 
   if(isGpsMenu) {
     gpsMenu.Lat.value = gps.lat.toFixed(4);
@@ -145,6 +255,7 @@ Bangle.on('GPS', function(newGps) {
 // Update heart rate monitor
 Bangle.on('HRM', function(newHrm) {
   hrm = newHrm;
+  isNewHrmData = true;
 
   if(isHrmMenu) {
     hrmMenu.BPM.value = hrm.bpm;
@@ -156,6 +267,7 @@ Bangle.on('HRM', function(newHrm) {
 // Update magnetometer
 Bangle.on('mag', function(newMag) {
   mag = newMag;
+  isNewMagData = true;
 
   if(isMagMenu) {
     magMenu.x.value = mag.x;
@@ -169,9 +281,9 @@ Bangle.on('mag', function(newMag) {
 
 // On start: enable sensors and display main menu
 g.clear();
-transmitAppName();
 Bangle.setBarometerPower(isBarEnabled, APP_ID);
 Bangle.setGPSPower(isGpsEnabled, APP_ID);
 Bangle.setHRMPower(isHrmEnabled, APP_ID);
 Bangle.setCompassPower(isMagEnabled, APP_ID);
-E.showMenu(mainMenu);
\ No newline at end of file
+E.showMenu(mainMenu);
+setInterval(transmitUpdatedSensorData, 1000);
\ No newline at end of file