I leave GPS turned on all the time (doesn't matter no programs using GPS are running in background) to be accessible when I start navigation. The problem is, that GPS is still trying to get time from NTP server in all cases. I work mostly underground with phone switched to airplane mode, but GPS is still trying to get time from NTP server every 13 minutes, which drains the battery a lot. I have just plain GPS enabled, A-GPS is turned off. Is there a possibility how to disable NTP synchronization initiated by GPS service without turning GPS off?