Regardless if you disable the gps in your phone emergency services i.e. 911, police, fire can still located you. Sim or not you are connected to the cell towers in your area, thats why you can still make emergency calls if you have no sim card.
If you truly want to be not findable put your phone into "airplane mode". It will disable the radio within the phone.
If you truly want to be not findable put your phone into "airplane mode". It will disable the radio within the phone.