The up to date equivalent of your current map is United States 960.7075 that you can download from one of our uploaders
[Please Register or Login to download file] but at 915MB it could be a tight squeeze. If that's the case, you'll need to specify a region of US that'll suit your needs.
Once downloaded, move your old map to a safe location then extract the new map to your device and activate it using
FastActivate following the instructions on that page.