diff --git a/timeturner.py b/timeturner.py
index 926629c..07ef717 100644
--- a/timeturner.py
+++ b/timeturner.py
@@ -7,17 +7,19 @@ import subprocess
 import os
 import threading
 import queue
+from collections import deque
 
 SERIAL_PORT = None
 BAUD_RATE = 115200
 FRAME_RATE = 25.0
 
-lock_count = 0
-free_count = 0
 sync_pending = False
-
 ltc_data_queue = queue.Queue()
 latest_ltc = None
+offset_history = deque(maxlen=20)
+
+lock_total = 0
+free_total = 0
 
 def find_teensy_serial():
     for dev in os.listdir('/dev'):
@@ -58,7 +60,7 @@ def format_time(dt):
     return dt.strftime("%H:%M:%S.%f")[:-3]
 
 def run_curses(stdscr):
-    global FRAME_RATE, lock_count, free_count, sync_pending, SERIAL_PORT, latest_ltc
+    global FRAME_RATE, sync_pending, SERIAL_PORT, latest_ltc, offset_history, lock_total, free_total
 
     curses.curs_set(0)
     stdscr.nodelay(True)
@@ -71,52 +73,80 @@ def run_curses(stdscr):
         time.sleep(2)
         return
 
-    # Start serial reader thread
     thread = threading.Thread(target=serial_thread, args=(SERIAL_PORT, BAUD_RATE, ltc_data_queue), daemon=True)
     thread.start()
 
     while True:
         try:
-            # Pull latest from queue if available
+            # Pull latest from queue
             while not ltc_data_queue.empty():
                 parsed, arrival_time = ltc_data_queue.get_nowait()
                 latest_ltc = (parsed, arrival_time)
 
+                # Update lock ratio counters
+                if parsed["status"] == "LOCK":
+                    lock_total += 1
+                else:
+                    free_total += 1
+
+                # Record sync offset
+                offset_ms = (get_system_time() - arrival_time).total_seconds() * 1000
+                offset_frames = offset_ms / (1000 / parsed["frame_rate"])
+                offset_history.append((offset_ms, offset_frames))
+
+                if sync_pending:
+                    do_sync(stdscr, parsed, arrival_time)
+                    sync_pending = False
+
+            # Draw UI
             stdscr.erase()
-            stdscr.addstr(0, 2, "NTP Timeturner v0.9")
+            stdscr.addstr(0, 2, "NTP Timeturner v1.0")
             stdscr.addstr(1, 2, f"Using Serial Port: {SERIAL_PORT}")
 
             if latest_ltc:
                 parsed, arrival_time = latest_ltc
                 FRAME_RATE = parsed["frame_rate"]
-                if parsed["status"] == "LOCK":
-                    lock_count += 1
-                else:
-                    free_count += 1
 
                 stdscr.addstr(3, 2, f"LTC Status   : {parsed['status']}")
                 stdscr.addstr(4, 2, f"LTC Timecode : {parsed['hours']:02}:{parsed['minutes']:02}:{parsed['seconds']:02}:{parsed['frames']:02}")
                 stdscr.addstr(5, 2, f"Frame Rate   : {FRAME_RATE:.2f}fps")
                 stdscr.addstr(6, 2, f"System Clock : {format_time(get_system_time())}")
 
-                offset_ms = (get_system_time() - arrival_time).total_seconds() * 1000
-                offset_frames = offset_ms / (1000 / FRAME_RATE)
-                stdscr.addstr(7, 2, f"Sync Offset  : {offset_ms:+.0f} ms ({offset_frames:+.0f} frames)")
+                if offset_history:
+                    avg_ms = sum(x[0] for x in offset_history) / len(offset_history)
+                    avg_frames = sum(x[1] for x in offset_history) / len(offset_history)
+
+                    # Optional colour coding
+                    if abs(avg_ms) < 10:
+                        color = curses.color_pair(2)
+                    elif abs(avg_ms) < 40:
+                        color = curses.color_pair(3)
+                    else:
+                        color = curses.color_pair(1)
+
+                    stdscr.attron(color)
+                    stdscr.addstr(7, 2, f"Sync Offset  : {avg_ms:+.0f} ms ({avg_frames:+.0f} frames)")
+                    stdscr.attroff(color)
+                else:
+                    stdscr.addstr(7, 2, "Sync Offset  : …")
+
+                total = lock_total + free_total
+                lock_pct = (lock_total / total) * 100 if total else 0
+                stdscr.addstr(8, 2, f"Lock Ratio   : {lock_pct:.1f}% LOCK")
             else:
                 stdscr.addstr(3, 2, "LTC Status   : (waiting)")
                 stdscr.addstr(4, 2, "LTC Timecode : …")
                 stdscr.addstr(5, 2, "Frame Rate   : …")
                 stdscr.addstr(6, 2, f"System Clock : {format_time(get_system_time())}")
                 stdscr.addstr(7, 2, "Sync Offset  : …")
+                stdscr.addstr(8, 2, "Lock Ratio   : …")
 
-            stdscr.addstr(8, 2, f"Lock Ratio   : {lock_count} LOCK / {free_count} FREE")
             stdscr.addstr(10, 2, "[S] Set system clock to LTC    [Ctrl+C] Quit")
             stdscr.refresh()
 
             key = stdscr.getch()
             if key in (ord('s'), ord('S')) and latest_ltc:
-                do_sync(stdscr, latest_ltc[0], latest_ltc[1])
-                sync_pending = False
+                sync_pending = True
 
         except KeyboardInterrupt:
             break
@@ -141,4 +171,10 @@ def do_sync(stdscr, parsed, arrival_time):
         stdscr.addstr(13, 2, f"❌ Sync failed: {e}")
 
 if __name__ == "__main__":
+    # Optional: enable basic color scheme
+    curses.initscr()
+    curses.start_color()
+    curses.init_pair(1, curses.COLOR_RED, curses.COLOR_BLACK)    # bad
+    curses.init_pair(2, curses.COLOR_GREEN, curses.COLOR_BLACK)  # perfect
+    curses.init_pair(3, curses.COLOR_YELLOW, curses.COLOR_BLACK) # ok
     curses.wrapper(run_curses)