diff --git a/apps/altimeter/ChangeLog b/apps/altimeter/ChangeLog
index 905152382..77f64d029 100644
--- a/apps/altimeter/ChangeLog
+++ b/apps/altimeter/ChangeLog
@@ -2,3 +2,4 @@
 0.02: Actually upload correct code
 0.03: Display sea-level pressure, too, and allow calibration
 0.04: Switch to using system code for pressure calibration
+0.05: Prompt before resetting calibration (stops long-press of button resetting calibration)
\ No newline at end of file
diff --git a/apps/altimeter/app.js b/apps/altimeter/app.js
index 6e44161da..222ed2d21 100644
--- a/apps/altimeter/app.js
+++ b/apps/altimeter/app.js
@@ -7,6 +7,7 @@ var R = Bangle.appRect;
 var y = R.y + R.h/2;
 var MEDIANLENGTH = 20;
 var avr = [];
+var updateDisplay = true;
 
 function fmt(t) {
   if ((t > -100) && (t < 1000))
@@ -19,48 +20,57 @@ function fmt(t) {
 Bangle.on('pressure', function(e) {
   while (avr.length>MEDIANLENGTH) avr.pop();
   avr.unshift(e.altitude);
-  let median = avr.slice().sort();
+  if (!updateDisplay) return;
+  let median = avr.slice().sort(), value;
   g.reset().clearRect(0,y-30,g.getWidth()-10,R.h);
   if (median.length>10) {
     var mid = median.length>>1;
-    var value = E.sum(median.slice(mid-4,mid+5)) / 9;
+    value = E.sum(median.slice(mid-4,mid+5)) / 9;
   } else {
-    var value = median[median.length>>1];
+    value = median[median.length>>1];
   }
-  t = fmt(value);
+  var t = fmt(value);
 
   g.setFont("Vector",50).setFontAlign(0,0).drawString(t, g.getWidth()/2, y);
 
   let o = Bangle.getOptions();
   let sea = o.seaLevelPressure;
   t = sea.toFixed(1) + " " + e.temperature.toFixed(1);
-  if (0) {
+  /*if (0) {
       print("alt raw:", value.toFixed(1));
       print("temperature:", e.temperature);
       print("pressure:", e.pressure);
       print("sea pressure:", sea);
-  }
+  }*/
     g.setFont("Vector",25).setFontAlign(-1,0).drawString(t, 10, R.y+R.h - 35);
 });
 
 function setPressure(m, a) {
-  o = Bangle.getOptions();
-  print(o);
+  var o = Bangle.getOptions();
+  //print(o);
   o.seaLevelPressure = o.seaLevelPressure * m + a;
   Bangle.setOptions(o);
   avr = [];
 }
 
-print(g.getFonts());
-g.reset();
-g.setFont("Vector:15");
-g.setFontAlign(0,0);
-g.drawString(/*LANG*/"ALTITUDE (m)", g.getWidth()/2, y-40);
-g.drawString(/*LANG*/"SEA L (hPa) TEMP (C)", g.getWidth()/2, y+62);
-g.flip();
-g.setFont("6x8").setFontAlign(0,0,3).drawString(/*LANG*/"STD", g.getWidth()-5, g.getHeight()/2);
-Bangle.setUI("updown", btn=> {
-  if (!btn) setPressure(0, 1013.25);
-  if (btn<0) setPressure(1, 1);
-  if (btn>0) setPressure(1, -1);
-});
+function start() {
+  g.reset();
+  g.setFont("Vector:15");
+  g.setFontAlign(0,0);
+  g.drawString(/*LANG*/"ALTITUDE (m)", g.getWidth()/2, y-40);
+  g.drawString(/*LANG*/"SEA L (hPa) TEMP (C)", g.getWidth()/2, y+62);
+  g.setFont("6x8").setFontAlign(0,0,3).drawString(/*LANG*/"STD", g.getWidth()-5, g.getHeight()/2);
+  updateDisplay = true;
+  Bangle.setUI("updown", btn => {
+    if (!btn) {
+      updateDisplay = false;
+      E.showPrompt(/*LANG*/"Set calibration to default?",{title:/*LANG*/"Altitude"}).then(function(reset) {
+        start();
+        if (reset) setPressure(0, 1013.25);
+      });
+    }
+    if (btn<0) setPressure(1, 1);
+    if (btn>0) setPressure(1, -1);
+  });
+}
+start();
\ No newline at end of file
diff --git a/apps/altimeter/metadata.json b/apps/altimeter/metadata.json
index ff5eb9935..2c8bf06ec 100644
--- a/apps/altimeter/metadata.json
+++ b/apps/altimeter/metadata.json
@@ -1,6 +1,6 @@
 { "id": "altimeter",
   "name": "Altimeter",
-  "version":"0.04",
+  "version":"0.05",
   "description": "Simple altimeter that can display height changed using Bangle.js 2's built in pressure sensor.",
   "icon": "app.png",
   "tags": "tool,outdoors",
diff --git a/apps/lint_exemptions.js b/apps/lint_exemptions.js
index 6b64d6149..980164b09 100644
--- a/apps/lint_exemptions.js
+++ b/apps/lint_exemptions.js
@@ -925,12 +925,6 @@ module.exports = {
       "no-undef"
     ]
   },
-  "apps/fileman/fileman.app.js": {
-    "hash": "f378179e7dd3655ba7e9ce03e1f7fd5a2d1768ad7d9083b22e7d740405be842a",
-    "rules": [
-      "no-undef"
-    ]
-  },
   "apps/flappy/app.js": {
     "hash": "e24b0c5e0469070e02dae00887bf50569c2c141a80c7c356b36987ddf68ce9cc",
     "rules": [
@@ -1051,12 +1045,6 @@ module.exports = {
       "no-undef"
     ]
   },
-  "apps/altimeter/app.js": {
-    "hash": "054ac328db51034aa339f1d10b4d264badd49438b95f08bc6fbfb90bd88c6ae0",
-    "rules": [
-      "no-undef"
-    ]
-  },
   "apps/alpinenav/app.js": {
     "hash": "f8e59724d282f7c5c989adf64974a3728dc521aa8fbe047b7c37dae09213095a",
     "rules": [