diff --git a/boot/rocket.ks b/boot/rocket.ks
index 380a147..832a92d 100644
--- a/boot/rocket.ks
+++ b/boot/rocket.ks
@@ -3,10 +3,11 @@ runoncepath("0:/lib/boot").
 parameter debug is false.
 
 local compiled is list(
+  "/lib/launch_rocket",
   "/lib/navigation",
-  "/lib/throttle",
+  "/lib/node",
   "/lib/stabilize_rocket",
-  "/lib/node"
+  "/lib/throttle"
 ).
 
 local copied is list(
diff --git a/init/rocket.ks b/init/rocket.ks
index f1ad391..1acc9f0 100644
--- a/init/rocket.ks
+++ b/init/rocket.ks
@@ -1,10 +1,11 @@
 @lazyglobal off.
 
+runoncepath("/lib/ui").
 runoncepath("/lib/navigation").
 runoncepath("/lib/throttle").
 runoncepath("/lib/node").
 runoncepath("/lib/stabilize_rocket").
-runoncepath("/lib/ui").
+runoncepath("/lib/launch_rocket").
 
 clearguis().
 
@@ -90,7 +91,7 @@ row:AddLabel("Gravity Turn Pitch").
 local gravPitch is row:AddTextField("75").
 
 makeButton(top, "Execute", {
-    run "/launch"(
+    Launch(
     targetApo:TEXT:ToNumber(),
     gravTurnStart:TEXT:ToNumber(),
     gravPitch:TEXT:ToNumber(),
diff --git a/lib/launch_rocket.ks b/lib/launch_rocket.ks
new file mode 100644
index 0000000..ec9c3cb
--- /dev/null
+++ b/lib/launch_rocket.ks
@@ -0,0 +1,71 @@
+runoncepath("lib/throttle").
+runoncepath("lib/navigation").
+runoncepath("lib/node").
+
+function Launch {
+  parameter APOAPSIS_TARGET is 80000.
+  parameter GRAVITY_TURN_START is 8000.
+  parameter GRAVITY_PITCH is 75.
+  parameter INITIAL_PITCH is 85.
+  parameter MINIMUM_PITCH is 5.
+
+  local ATMO_TWR is 1.6.
+
+  // Configure subsystems.
+  RCS off.
+  SAS off.
+
+  // Countdowns are cute.
+  print "Initiating automated launch sequence.".
+  from { local x is 5. } until x = 0 step { set x to x - 1. } do {
+    print "..." + x.
+    wait 0.5.
+  }
+
+  // Hold throttle to maintain 1.5 TWR.
+  // We do *not* use a PID Loop here because we can
+  // calculate the correct value discretely.
+  lock THROTTLE to ThrottleToTWR(ATMO_TWR).
+  print "Throttling to maintain a TWR  of " + ATMO_TWR.
+
+  // Main ascent control.
+  lock STEERING to heading(90,90,270).
+  stage.
+  wait until SHIP:ALTITUDE > 200.
+
+  print "Vectoring away from launchpad.".
+  lock STEERING to heading(90, INITIAL_PITCH, 270).
+  wait until SHIP:ALTITUDE > GRAVITY_TURN_START.
+
+  print "Pitching for gravity turn.".
+  // Pitch over...
+  lock STEERING to heading(90, GRAVITY_PITCH, 270).
+  // Wait until we have rotated to (approximately) that pitch...
+  wait until vectorangle(
+    SHIP:FACING:FOREVECTOR,
+    STEERINGMANAGER:TARGET:FOREVECTOR)
+    < 0.5.
+
+  // then wait until Prograde catches up (or passes us).
+  local targetPitch is GetPitch(STEERINGMANAGER:TARGET:FOREVECTOR).
+  wait until GetPitch(SHIP:SRFPROGRADE:FOREVECTOR) <= targetPitch.
+
+  print "Locking to prograde, letting gravity do the hard work.".
+  lock STEERING to GetAscentVector(MINIMUM_PITCH).
+  wait until SHIP:ALTITUDE > 32000. // todo: if we have a pressure sensor we can use it to decide when to kick the throttle up instead, neat solution for e.g. Duna and Eve.
+
+  lock THROTTLE to 1.0.
+  wait until SHIP:ORBIT:APOAPSIS > APOAPSIS_TARGET.
+
+  lock THROTTLE to 0.0.
+  set SHIP:CONTROL:PILOTMAINTHROTTLE to 0.
+  wait 0.001. // make sure these control updates get applied
+
+  print "Target apoapsis acquired. Creating maneuver node.".
+  add CreateCircularizationNode().
+  ExecNode().
+  print "Orbit acquired. Releasing controls. Good luck, Kerman.".
+  unlock THROTTLE.
+  unlock STEERING.
+  SAS on.
+}
diff --git a/rocket/launch.ks b/rocket/launch.ks
deleted file mode 100644
index ff41afd..0000000
--- a/rocket/launch.ks
+++ /dev/null
@@ -1,69 +0,0 @@
-runoncepath("lib/throttle").
-runoncepath("lib/navigation").
-runoncepath("lib/node").
-
-parameter APOAPSIS_TARGET is 80000.
-parameter GRAVITY_TURN_START is 8000.
-parameter GRAVITY_PITCH is 75.
-parameter INITIAL_PITCH is 85.
-parameter MINIMUM_PITCH is 5.
-
-local ATMO_TWR is 1.6.
-
-// Configure subsystems.
-RCS off.
-SAS off.
-
-// Countdowns are cute.
-print "Initiating automated launch sequence.".
-from { local x is 5. } until x = 0 step { set x to x - 1. } do {
-  print "..." + x.
-  wait 0.5.
-}
-
-// Hold throttle to maintain 1.5 TWR.
-// We do *not* use a PID Loop here because we can
-// calculate the correct value discretely.
-lock THROTTLE to ThrottleToTWR(ATMO_TWR).
-print "Throttling to maintain a TWR  of " + ATMO_TWR.
-
-// Main ascent control.
-lock STEERING to heading(90,90,270).
-stage.
-wait until SHIP:ALTITUDE > 200.
-
-print "Vectoring away from launchpad.".
-lock STEERING to heading(90, INITIAL_PITCH, 270).
-wait until SHIP:ALTITUDE > GRAVITY_TURN_START.
-
-print "Pitching for gravity turn.".
-// Pitch over...
-lock STEERING to heading(90, GRAVITY_PITCH, 270).
-// Wait until we have rotated to (approximately) that pitch...
-wait until vectorangle(
-  SHIP:FACING:FOREVECTOR,
-  STEERINGMANAGER:TARGET:FOREVECTOR)
-  < 0.5.
-
-// then wait until Prograde catches up (or passes us).
-local targetPitch is GetPitch(STEERINGMANAGER:TARGET:FOREVECTOR).
-wait until GetPitch(SHIP:SRFPROGRADE:FOREVECTOR) <= targetPitch.
-
-print "Locking to prograde, letting gravity do the hard work.".
-lock STEERING to GetAscentVector(MINIMUM_PITCH).
-wait until SHIP:ALTITUDE > 32000. // todo: if we have a pressure sensor we can use it to decide when to kick the throttle up instead, neat solution for e.g. Duna and Eve.
-
-lock THROTTLE to 1.0.
-wait until SHIP:ORBIT:APOAPSIS > APOAPSIS_TARGET.
-
-lock THROTTLE to 0.0.
-set SHIP:CONTROL:PILOTMAINTHROTTLE to 0.
-wait 0.001. // make sure these control updates get applied
-
-print "Target apoapsis acquired. Creating maneuver node.".
-add CreateCircularizationNode().
-ExecNode().
-print "Orbit acquired. Releasing controls. Good luck, Kerman.".
-unlock THROTTLE.
-unlock STEERING.
-SAS on.