diff --git a/pi/backend/gps_service.py b/pi/backend/gps_service.py
index 9c37e00..c2cc4d7 100644
--- a/pi/backend/gps_service.py
+++ b/pi/backend/gps_service.py
@@ -11,7 +11,7 @@ from typing import Any
 # When True: skips gpsd entirely, generates realistic mock data
 # When False: connects to real gpsd (requires GPS device)
 # ============================================================================
-_GPS_DEBUG = True
+_GPS_DEBUG = False
 
 # gpsdclient is a modern, simple gpsd client
 # Install gpsd on Pi: sudo apt install gpsd gpsd-clients
@@ -212,8 +212,8 @@ class GPSService:
         signal_lost = False
         signal_lost_until = 0.0
 
-        # Simulate cold start acquisition (~3s)
-        acquiring_until = time.time() + 3.0
+        # Simulate cold start acquisition (~30s)
+        acquiring_until = time.time() + 30.0
 
         # Base position (Tokyo area)
         base_lat = 35.6762