Hi there and welcome
It can be and you can purchase the screen here
Dissasembling it though can be difficult, especially with getting the ribbon into the holder, but a cell phone repair store can do this for you as it is very similar.
If you tell me where you are located, I can find one in your area?
I found D Cell Repair that do cell repairs for you and can be contacted with the below details. Doing Cell repairs, they should also be able to do the Nuvi.
2721 US-1, Fort Pierce, FL 34982
If you have continued problems, or would like any additional information or assistance, please do not hesitate to let me know.
And please take a second to rate my service by clicking one of the stars at the top of the screen then submit