Hi Jim. My name is***** am sorry that you are having this problem. It would be my pleasure to assist you. Your Garmin Nuvi may only accept the official 2 letter abbreviation for the states. Montana would be MT. Please try that and let me know the results. If that does not resolve the problem, please let me know the model number of your Nuvi.
Hi there! My name is***** am a computer professional with over 15 years of experience with both Mac and Windows computers, phones, tablets, and printers. It would be my pleasure to assist you with this. I apologize for my first response. That was meant for an entirely different question. Can you tell me what operating system you have on your computer please? If you're not sure, please click this link and tell me what you see: