Changed setInterval() to Bangle.on(GPS)

speed.trailsense.js

@@ -1,6 +1,5 @@
 (() => {
 let STOR = require("Storage");
-let updateInterval;
 let lastSpeed;
 
 function drawFace() {
@@ -46,9 +45,8 @@ function drawFace() {
   }
 
 
-  updateInterval = setInterval(
-  () => {
-    var gps_fix = Bangle.getGPSFix();
+  Bangle.on("GPS", 
+    (gps_fix) => {
       var speed = round(gps_fix.speed, 1);
       if(speed<3.4) speed="0.0";
       if(Number(speed)>maxSpeed) maxSpeed = speed;
@@ -84,14 +82,13 @@ function drawFace() {
         naNShown = true;
       }
       lastSpeed = speed;  // set last speed var for next loop
-  }, 100)
+  })
 }
 
 function stop() {
   g.clear();
+  Bangle.removeAllListeners();
   Bangle.setGPSPower(false);
-  print("[DEBUG] updateInterval=" + updateInterval);
-  clearInterval(updateInterval);
 }
 
 return { drawFace:drawFace, stop:stop };