diff --git a/Aircraft/Instruments-3d/ISFD/ISFD.nas b/Aircraft/Instruments-3d/ISFD/ISFD.nas
index 39aa45682..69f30627b 100644
--- a/Aircraft/Instruments-3d/ISFD/ISFD.nas
+++ b/Aircraft/Instruments-3d/ISFD/ISFD.nas
@@ -579,7 +579,6 @@ createAltimeterSetting: func()
 {
     me._altimeterText = me.root.createChild('text', 'altimeter-setting-text');
     me._altimeterText.setText('1013');
-    me._altimeterText.setFontSize(44);
     me._altimeterText.setAlignment("right-center");
     me._altimeterText.setFont("LiberationFonts/LiberationMono-Regular.ttf");
     me._altimeterText.setColor('#00ff00');
@@ -742,11 +741,19 @@ update : func()
 
 # barometric
     if (me._controller.isSTDBarometricPressure()) {
+        me._altimeterText.setFontSize(44);
         me._altimeterText.setText('STD');
-    } elsif (me._controller.isHPaBarometer()) {
-        me._altimeterText.setText(sprintf('%4d HPA', me._controller.getBarometricPressureSettingHPa()));
     } else {
-        me._altimeterText.setText(sprintf('%4.2f IN', me._controller.getBarometricPressureSettingInHg()));
+        var s = '';
+        if (me._controller.isHPaBarometer()) {
+            s = sprintf('%4d HPA', me._controller.getBarometricPressureSettingHPa());
+        } else {
+            s = sprintf('%4.2f IN', me._controller.getBarometricPressureSettingInHg());            
+        }
+
+        # smaller text to fit
+        me._altimeterText.setFontSize(32);
+        me._altimeterText.setText(s);
     }
 
 # APProach mode
diff --git a/Aircraft/Instruments-3d/ISFD/ISFDGenericController.nas b/Aircraft/Instruments-3d/ISFD/ISFDGenericController.nas
index ed65c28c3..f5ccafb7b 100644
--- a/Aircraft/Instruments-3d/ISFD/ISFDGenericController.nas
+++ b/Aircraft/Instruments-3d/ISFD/ISFDGenericController.nas
@@ -92,17 +92,17 @@ var GenericController =
     setprop(me._altimeterProp ~ "setting-hpa", hpa);
   },
 
-  isApproachMode: func { return me._approachMode; },
+  isApproachMode: func { return (me._approachMode != 0); },
   toggleApproachMode : func { me._approachMode = (me._approachMode == 0); },
 
   isLocalizerValid: func { return getprop(me._navRadio ~ "in-range"); },
   isGSValid: func { return getprop(me._navRadio ~ "gs-in-range");},
 
   getLocalizerDeviationNorm: func {
-    return getprop(me._navRadio ~ "heading-needle-deflection-norm");
+    return getprop(me._navRadio ~ "heading-needle-deflection-norm") or 0;
   },
 
   getGSDeviationNorm: func {
-    return getprop(me._navRadio ~ "gs-needle-deflection-norm");
+    return getprop(me._navRadio ~ "gs-needle-deflection-norm") or 0;
   },
 }
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