Hi there and welcome to Just Answer. I'm Steve. Thanks for asking your question. I'm sorry to hear about your GPS.
The previous expert is correct. The company that makes your GPS went out of business in 2009. There are no maps available for this device.
>>>CLICK HERE<<< for a Google search. You will see two links at the top for 'navi extras'. That site is dead. There is no other source for maps for Nextar units.