question about GPS use in brunei. i understand Maps app only use data for locking right?

so what if i start the Maps app in miri (sarawak), then i drive to brunei, does it still work? if i lock n unlock my phone in brunei, will it consume data to lock me again, or the GPS still can detect my position even when my phone is sleeping?

dun want to kena charge roaming data rates

normal sms no problem. it doesnt have anything to do with data connection