Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Im well aware of this issue, and its common with the older nuvi devices.
The problem is it doesnt have enough internal memory to hold the entire US map.. And it sounds like you have just the East coast region loaded.
So we need to connect the Garmin to a computer that has the Garmin express program installed.
Once it loads and downloads the maps, it will let you click and select a different map region.. Such as West coast ( for California and west coast states )
if you get stuck or run into any issues, let me know.
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.