diff --git a/lib/sensors.ks b/lib/sensors.ks
index 64447b5..001b370 100644
--- a/lib/sensors.ks
+++ b/lib/sensors.ks
@@ -4,7 +4,9 @@ function buildSensorList {
   local sList is Lexicon().
   list SENSORS in SensorList.
   for s in SensorList {
-    sList:add(s:type, s).
+    if not sList:HasKey(s:type) {
+      sList:add(s:type, s).
+    }
   }
   return sList.
 }
@@ -22,5 +24,5 @@ function ReadSensor {
   if not sList:HasKey(s) {
     return -1. // TODO: is -1 an impossible result for all sensors? I suspect not...
   }
-  return sList[s].
+  return s:DISPLAY:TOSCALAR.
 }
diff --git a/lib/stabilize_rocket.ks b/lib/stabilize_rocket.ks
index d8dcf4a..a3dbf80 100644
--- a/lib/stabilize_rocket.ks
+++ b/lib/stabilize_rocket.ks
@@ -44,8 +44,8 @@ function Hover {
 }
 
 function alignForHover {
-  if ReadSensor("pres") = 0 {
-    // if we're in a vacuum, cancel all velocity first...
+  if ReadSensor("PRES") = 0 {
+    // if we're in a vacuum, align with retrograde for smoother horizontal control.
     lock STEERING to SHIP:SRFRETROGRADE.
     print "Aligning with retrograde.".
     wait until done or VAng(SHIP:FACING:FOREVECTOR, SHIP:SRFRETROGRADE:FOREVECTOR) < 0.1.
@@ -54,7 +54,7 @@ function alignForHover {
       return.
     }
   } else {
-    // ... otherwise just cancel vertical velocity
+    // ... otherwise just align vertically.
     lock STEERING to SHIP:UP.
     print "Aligning vertical.".
     wait until done or VAng(SHIP:FACING:FOREVECTOR, SHIP:UP:FOREVECTOR) < 1.
@@ -76,6 +76,6 @@ function restoreControl {
   unlock THROTTLE.
   unlock STEERING.
   SAS on.
-  print "Stabilized operation ended. Returning control to pilot.".
+  print "Done.".
   set done to false.
 }