Hi again and thanks for that information.
The "NW" at the end of the Lower 49 states tell us that the "North West" states are loaded in the device. Below is a link to an image that show what states are covered in the NW areas.
If you want to avoid this issue in the future, I HIGHLY recommend that you purchase a 4GB or 8GB SD card (memory card) and then reload ALL of the 49 states, which will fit on those size cards.
As a reference, I did a search on Amazon for an 8GB SD card, and I have a link to the search results below.
8GB SD card SEARCH results
The alternative to getting an SD card to hold ALL the states is to reload the regions that WILL fit in the INTERNAL memory of the device, that you plan to use in your upcoming travels. But that process will have to be repeated any time you decide to travel to an area that is NOT covered in the detailed maps that are loaded.
As another reference, I have a link to the Garmin page that shows the states and regions covered by each of these "sub-set" of maps.
Click here >> Map Regions <<.
NOTE: At the bottom of that page there are a few other article links that explain about SD card compatibility, and loading maps directly onto an SD card. Please take a look at those articles for more details about the process.
I hope this helps explain what is happening with your maps & device. Please let me know if you have any more questions.
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Thanks, ***** *****